# Shape, space and measures 1

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1 Shape, space and measures 1 contents There are three lessons in this unit, Shape, space and measures 1. S1.1 Lines, length and perimeter 3 S1.2 Area of a rectangle 6 S1.3 Solving problems 9 Resource sheets for the lessons 12 objectives The objectives covered in this unit are: Convert between m and cm, and cm and mm. Use a ruler to measure and draw lines to the nearest centimetre or millimetre. Understand that area is measured in square centimetres (cm 2 ). Know and use the formula for the area of a rectangle; calculate the perimeter and area of shapes made from rectangles. Solve problems and investigate in shape, space and measures. Explain and justify methods and conclusions. 1 Level 3 to level 4 lessons Shape, space and measures 1

2 Using the lesson plans in this unit These lesson plans supplement the Springboard 7 materials for Key Stage 3 pupils working toward level 4 in mathematics. All the lessons are examples only. There is no requirement to use them. If you decide to use the lessons, you will need to prepare overhead projector transparencies (OHTs) and occasional resource sheets for pupils to use. The lessons consolidate work at level 3 and extend into level 4. They are suitable for a group of pupils or a whole class. Whatever the size of the group, the pupils are referred to as the class. Each lesson will support about 30 to 40 minutes of direct teaching. To help match the time to your timetable, each plan refers to other tasks for pupils, based on Springboard 7 resources. Select from these, textbook exercises or your own materials to provide practice and consolidation in the main part of a lesson and to set homework. Aim to choose tasks that vary in their level of demand, to suit pupils knowledge, confidence and rate of progress. Although the other tasks are listed for convenience at the end of the main part of the lesson, they can be offered at any point, especially between the episodes that form the main activity. The lesson starters are of two kinds: practice starters and teaching starters. The former are opportunities to rehearse skills that will be needed later in the lesson. Teaching starters introduce an idea that is then developed in the main activity. You will need to tell pupils what they will learn in the lesson, either in the starter or at the beginning of the main activity. Use the plenary to check pupils learning against the lesson s objectives and to draw attention to the key points that pupils should remember. Interactive teaching programs (ITPs) Interactive teaching programs are interactive animated visual aids that can be used with a laptop and data projector or with an interactive whiteboard. As extra support for this unit, you may find it useful to download and use these ITPs from the website for lesson S1.1: for lesson S1.2: for lesson S1.3: Polygon Ruler Area Area 2 Level 3 to level 4 lessons Shape, space and measures 1

4 Resources (cont.) 30 cm ruler and pencil for each pupil OHTs S1.1a, S1.1c blank OHT Resource S1.1b demonstrating how to line up one end with the zero mark on the ruler. Show how to measure to the nearest centimetre by rounding up or down as appropriate. Refer pupils to their own rulers. Ask them to measure the length of their pencil to the nearest centimetre. Stress that the zero mark on the ruler must line up with the end of the pencil. Discuss the lengths and record one or two of them on the board, including the abbreviation cm for centimetres. Repeat the process, asking pupils to measure one or two more lengths to the nearest centimetre, such as the height and width of their exercise books. Refer again to the transparent ruler on the projector. What are the divisions between 7cm and 8cm? (millimetres) How many of them are there? (10) Write on the board: 1cm = 10mm. Explain that mm is a short way of writing millimetre, and that each millimetre is one tenth of a centimetre. Say that using millimetres can help to measure lengths more accurately. Show OHT S1.1a. Demonstrate how to measure the length of line A to the nearest millimetre, positioning the transparent ruler s zero mark against one end. How many whole centimetres long is this line? (e.g. 8cm) How many extra millimetres is it? (e.g. 4mm) What is its length? (e.g. 8cm 4mm) How many millimetres long is the line? (e.g. 84mm) Write on the board: 8cm 4mm = 84mm. Invite pupils to the projector to measure lines B, C and D. Now use a blank transparency to show the class how to draw a line XY of length 7cm. Position the transparent ruler and draw along it from the zero mark on the left to the 7cm mark on the right. Label the line X at one end and Y at the other, and write 7cm about halfway along it. Repeat by drawing a line 97mm long. Give out Resource S1.1b and ask pupils to measure and draw the lines indicated. Display OHT S1.1c. Explain that the grid is in centimetres. What is the name of shape A? (a rectangle) And of shape D? (a square) How do we find the perimeter of shape A? Establish that perimeter is the distance around the shape. Ask pupils to work out the perimeters of rectangles A, B, C and D and to write the answers on their whiteboards in centimetres. Discuss the answers, writing on the board: perimeter of A is = 16cm perimeter of B is = 24cm perimeter of C is = 20cm perimeter of D is = 20cm Establish that another way to find the perimeter of a rectangle is to add together the length and width, and multiply by 2. Record on the board next to the above: (5 + 3) 2 = 16cm (10 + 2) 2 = 24cm (6 + 4) 2 = 20cm (5 + 5) 2 = 20cm 4 Level 3 to level 4 lessons Shape, space and measures 1

5 other tasks Springboard 7 Unit 3 Unit 3 section 1: Perimeter 1 Distance round the edge page Calculating perimeters page Rectangle perimeters page 109 Star challenge 1: Different perimeters page 110 Star challenge 2: Regular polygons page 111 Unit 3 section 2: Centimetres and millimetres 1 Measuring lines page Longer and shorter lines page Adding cm and mm page Three ways to measure lines page 116 Star challenge 4: Rectangle perimeters page 117 plenary Resources mini-whiteboards Tell the class you are going to sketch a rectangle with a perimeter of 10cm. What could be the length and the width of my rectangle? Establish that half the perimeter is 5 cm, so that the length plus the width must be 5cm. The possibilities (for whole numbers of centimetres) are 4cm and 1cm, and 3cm and 2cm. Sketch both the rectangles and label the length and width in each case. Explain that your drawings do not show true measurements. Ask pupils to sketch on their whiteboards a rectangle with a perimeter of 12 centimetres, and to label the length and the width of the rectangle. Now sketch on the board a series of shapes, one by one. Label each side with a suitable length, in metres, centimetres or millimetres. For example: 20 mm 15 mm 15 mm 15 mm 15 mm 20 mm 6 m 10 m 8 m 2 cm 4 cm 2 cm 3 cm Ask pupils to calculate the perimeter of each shape and to write the answer on their whiteboards. In the case of the third diagram, invite a pupil to explain how to calculate the two missing lengths of edges. Remember When you are using a ruler to measure or draw lines, make sure that you position the zero mark on the ruler at the end of the line. Perimeter is the distance all the way round a shape. It is measured in units of length such as metres, centimetres or millimetres. To find the perimeter of a rectangle, add length and width, then multiply by 2. 1 metre is the same as 100 centimetres, and 1 centimetre is the same as 10 millimetres. 5 Level 3 to level 4 lessons Shape, space and measures 1

8 other tasks Springboard 7 Unit 3 Unit 3 section 4: Area 1 What is area? page Square centimetres page Areas of rectangles page The rule for the area of a rectangle page Area problems page 127 Star challenge 8: Measure and work out the area page 128 Star challenge 10: Units of area page 130 plenary Resources Resource S2.1e mini-whiteboards Tell the class you are going to sketch a rectangle with an area of 20 square centimetres. Each side is a whole number of centimetres. What could be the length and the width of my rectangle? Establish that the length multiplied by the width must be 20 square centimetres. The possibilities are 1cm by 20cm, 2cm by 10cm, and 4cm by 5cm. Sketch all three rectangles on the board and label the length and width in each case. Explain that your drawings do not show true measurements. Ask pupils to sketch on their whiteboards a rectangle with an area of 12 square centimetres, and to label the length and the width of their rectangle. Point out the three possibilities: 1cm by 12cm, 2cm by 6cm, and 3cm by 4cm. What is the same about all three rectangles? (the area) What is the perimeter of each rectangle? (26cm, 16cm, and 14cm) Give out copies of Resource S1.2e. Ask pupils to complete the two questions. Invite individual pupils to explain their methods to the rest of the class. Remember Area is the space inside a flat shape. It is measured in square units such as square centimetres, written as cm 2. Areas of shapes can be estimated or worked out by counting squares or part squares. Areas of some shapes can be found by surrounding them by a rectangle, working out the area of the extra parts, and subtracting this from the area of the surrounding rectangle. Shapes that have the same area do not necessarily have the same perimeter. 8 Level 3 to level 4 lessons Shape, space and measures 1

10 group to cooperate and to draw as many different tetromino shapes as they can. Tell them that just turning a shape around or flipping it over does not count as different. Put the first copy of OHT S1.3a on the projector. Invite different pupils to come to the projector to draw a tetromino. Continue adding tetrominoes until all five different shapes have been collected. Label the five shapes A to E. Discuss how to check the different possibilities by considering systematically adding one more square to the two shapes they made from three squares. A B C D E Ask the class to answer the following questions using their whiteboards. What is the area of each tetromino? (4 square centimetres) Which tetromino has the shortest perimeter? (B) Which of the tetrominoes have a line of symmetry? (A, B, E) Do any have more than one line of symmetry? (A, B) Repeat by asking the groups to make shapes from five identical squares (pentominoes). Invite different pupils to add different shapes to the second copy of OHT S1.3a. When they have run out of suggestions, display the top part of OHT S1.3b to show the complete set of 12 different shapes. A B C D E F G H I J K L What is the area of each pentomino? (5 square centimetres) Which pentomino has the shortest perimeter? (B) Which of the pentominoes have a line of symmetry? (A, C, D, E, G, L) Do any have more than one line of symmetry? (A, D) If time allows, reveal this shape on OHT S1.3b. Tell pupils to work again in their groups of four and ask them: Can you find four different pairs of pentominoes to fit into this shape? If any groups finish quickly, ask them to choose any pentomino and to fit six of the same shape together to form a pattern. There should be no holes or spaces between the six shapes. They should try to do this so that the perimeter of the shape formed from the six pentominoes is as small as possible. 10 Level 3 to level 4 lessons Shape, space and measures 1

11 What is the area of your shape made from six pentominoes? (30 square centimetres) What is the perimeter of your shape? other tasks Springboard 7 Unit 3 Unit 3 section 1: Perimeters Star challenge 3: Perimeter puzzle page 112 Unit 3 section 4: Area Star challenge 9: Wire rectangles page 129 plenary Resources squared paper rulers scissors Give each pupil a piece of squared paper. Tell them that they will need their rulers. Ask them to use a ruler to draw an 8cm by 8cm square on the squared paper, and to join the midpoint of one side to the opposite corner. They should cut out the two pieces formed. 4 cm 4 cm 8 cm Working with a partner, they should put the pieces together, joining edges that are the same length. How many different shapes can you make? (8 including the original) H A C D E G B F How do you know that you have found them all? (each possible pair of matching edges has been joined in the two possible ways) What is the same about all the shapes that you have made? (they all have the same area) How do you know? (they were all made from the same original 8 cm by 8 cm square) Can you explain why the perimeter of shape B is the same as the perimeter of the original square? Which shape has the smallest perimeter? (A and B) And the longest? (C and D) Ask pupils to use their rulers and to find out by measuring and calculating the length of the longest perimeter (about 42cm). Remember Shapes with the same area can have different perimeters. 11 Level 3 to level 4 lessons Shape, space and measures 1

12 OHT S1.1a line A line B line C line D 12 Level 3 to level 4 lessons Shape, space and measures 1

13 Resource S1.1b Estimate the length of each line in centimetres. Write your estimate above each line. Measure the length of each line to the nearest millimetre. Write the measured length below each line. B A C D F E G H Using the space below, draw a line 64mm long. Label the line P. Write the length on the line. Now draw a line 8.5cm long. Label the line RS. Write the length on the line. 13 Level 3 to level 4 lessons Shape, space and measures 1

14 OHT S1.1c Shape A Shape B Shape C Shape D 14 Level 3 to level 4 lessons Shape, space and measures 1

15 OHT S1.2a Here is a map of an island. Church Cave Wood Lighthouse Estimate the area of the wood.... squares Estimate the area of the island.... squares 15 Level 3 to level 4 lessons Shape, space and measures 1

16 OHT S1.2b Shape A Shape B Shape C Shape D Shape E 16 Level 3 to level 4 lessons Shape, space and measures 1

17 Resource S1.2c 17 Level 3 to level 4 lessons Shape, space and measures 1

18 OHT S1.2d 3 cm perimeter = cm perimeter = cm perimeter = cm area = cm 2 area = cm 2 area = cm 2 4 cm 6 cm 1 cm perimeter = cm perimeter = cm perimeter = cm area = cm 2 area = cm 2 area = cm 2 18 Level 3 to level 4 lessons Shape, space and measures 1

19 Resource S1.2e The L-shape is made from two rectangular tiles like this. 11 cm 5 cm What is the perimeter of the L-shape?... cm On the grid, draw a rectangle which has the same area as this shaded pentagon. Use a ruler. 19 Level 3 to level 4 lessons Shape, space and measures 1

20 OHT S1.3a 20 Level 3 to level 4 lessons Shape, space and measures 1

21 OHT S1.3b There are 12 different pentominoes. A B C D E F G H I J K L Which two pentominoes will fit into this shape? Find four different pairs. 21 Level 3 to level 4 lessons Shape, space and measures 1

22 22 Level 3 to level 4 lessons Shape, space and measures 1

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