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1 cups cups cup Fractions are a form of division. When I ask what is / I am asking How big will each part be if I break into equal parts? The answer is. This a fraction. A fraction is part of a whole. The top part of the fraction is the numerator and the bottom part is the denominator. Since < this is a proper fraction because the numerator is less than the denominator. In an improper fraction, the numerator is greater than or equal to the denominator, such as /, or /. Proper fractions have values less than and improper fractions have values greater than or equal to. whole cup is divided into equal parts. cup is of those equal parts. cup cup cup cup
2 Writing a Fraction in Lowest Terms 8 Notice the same size box is split three different ways in equal parts: in parts, parts, or 8 parts. By looking at the pictures, each box has the same portion (or fraction) filled, so these portions are called equivalent fractions. Fundamental Property of Fractions Multiplying or dividing the numerator AND the denominator of a fraction by the same nonzero number (not 0) does not change the value of the fraction. The fractions are equivalent. a b a a x x a and b x x
3 A Fraction in Lowest Terms Means the numerator and denominator have no common factor other than. The denominator is the lowest it can be. /8 is not in lowest terms because and 8 have common factors: and. goes into both the numerator,, and the denominator, 8, and also goes into both and 8. / is not in lowest terms because and have a common factor:. goes into both the numerator,, and the denominator,. is in lowest terms because there is no number (factor) that goes into both the numerator,, and the denominator,, other than. Do selfcheck: Are the following fractions in lowest terms? a) / b) /8 c) 9/ d) /
4 Using Greatest Common Factor (GCF) to reduce a fraction to its lowest terms The Greatest Common Factor is the largest number that goes into two numbers. What is the GCF of 0 and? The largest number that goes into both 0 and (the largest divisor of both 0 and ) Both numbers are divisible by. Is the GCF? 0 = 0, and =. But 0 and have common factors, so is not the GCF of 0 and. A bigger number can go into both 0 and. is the GCF of 0 and. 0 =, and =. and have no common factors, so is the GCF. To reduce a fraction to its lowest terms, find the GCF of the numerator and the denominator, and divide both the numerator and denominator by the GCF. 0 0 so is 0 in its lowest terms.
5 Example If you write the prime factorization both the numerator and denominator, the fraction in lowest terms is easily found by cancelling out the common prime factors. Write 90 in lowest terms = = 90 You can only cancel out factors on the bottom (denominator) with corresponding factors on the top (numerator).
6 FRACTIONS A fraction is just a division problem. Numerator Denominator = Numerator Denominator A fraction is in LOWEST TERMS, also known as REDUCED or SIMPLEST FORM when the numerator and denominator have no common factors. 0 is not in lowest terms, is in lowest terms A fraction can be put in reduced form by dividing both the numerator and the denominator by the GCF. This can be done easily by putting both the numerator and denominator in primefactored form and canceling the common factors between the numerator and denominator. 0 Mixed Number  A number, such as number and a fraction., consisting of an integer and a fraction. A mixed number is just the sum of a whole Improper Fraction  A fraction in which the numerator is larger than the denominator. Converting from mixed number to improper fraction: Mixed numbers must be converted to improper fractions or decimals before doing ANY MULTIPLICATION OR DIVISION OPERATIONS on them. denominato r numerator A fraction can be converted into a decimal by dividing: Numerator Denominator 0 When ADDING or SUBTRACTING FRACTIONS that must have the same denominator, then you just add the numerators and leave the denominator the same. However, consider 8
7 Expressing a fraction in higher terms: Later when we add fractions, we might have to express them in higher terms so that each fraction will have the same denominator. Example: Write / as an equivalent fraction with a denominator of 8.?? Example Write as an equivalent fraction with a denominator of. Is a fraction? We can make it one by writing it as.??
8 Multiplying fractions is easy: you multiply the top numbers and multiply the bottom numbers. For instance: When possible, you reduce. In this case, however, nothing reduces, because 8 and have no factors in common. If you're not sure, you can always do prime factorization: Nothing cancels. Copyright Often, though, something will cancel: Simplify Also, you can simplfiy by cancelling common factors between numerators and denominators. 9 9 Dividing fractions is just about as easy; there's just one extra step. When you divide by a fraction, the first thing you do is "flipnmultiply". That is, you take the second fraction, flip it upsidedown, and multiply it by the first fraction. (The upsidedown fraction is called the reciprocal). For instance: Simplify 8
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