This week math we have been working on multiplying, dividing, adding, and subtracting fractions.
Multiplying: Nothing reduces, because 8 and 45 have no factors in common. If you're not sure whether anything can be cancelled off, you can always factor the numerator and denominator, and check for any shared factors.
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 "flip-n-multiply". That is, you take the second fraction, flip it upside-down ("find the reciprocal"), and multiply the first fraction by this flipped fraction. Like fractions are fractions with the same denominator. You can add and subtract like fractions easily - simply add or subtract the numerators and write the sum over the common denominator. Before you can add or subtract fractions with different denominators, you must first find equivalent fractions with the same denominator, like this.
Multiplying: Nothing reduces, because 8 and 45 have no factors in common. If you're not sure whether anything can be cancelled off, you can always factor the numerator and denominator, and check for any shared factors.
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 "flip-n-multiply". That is, you take the second fraction, flip it upside-down ("find the reciprocal"), and multiply the first fraction by this flipped fraction. Like fractions are fractions with the same denominator. You can add and subtract like fractions easily - simply add or subtract the numerators and write the sum over the common denominator. Before you can add or subtract fractions with different denominators, you must first find equivalent fractions with the same denominator, like this.
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