By Michael Buckley
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Additional resources for Mathskills Pre-Algebra
Move the decimal point of the percent two places to the left to change the percent to a decimal. 2. Divide the part by the decimal. Example 4 is 25% of what number? 25 percent two places to the left to change the percent to a decimal. Step 2 Divide the part by the decimal. 25 = 16 Practice Find the whole in each situation. 1. 5 is 20% of what number? Move the decimal point of the percent two places to the left to change the percent to a decimal. 20% = Divide the part by the decimal. 5÷ = 2. 5 is 4% of what number?
2. To that answer add the numerator; this is the new numerator. 3. Keep the denominator as it is. Example 2 Rename the following mixed number to an improper fraction. 3 __ 5 Step 1 Multiply the denominator and the 3 × 5 = 15 whole number. Step 2 To that answer add the numerator. 15 + 2 = 17 Step 3 Keep the denominator as it is. 3 _25 = __ 17 5 Practice Rename each mixed number as an improper fraction. 3. 4 _34 Multiply the denominator and the whole number. 4× To that answer add the numerator.
Subtract the numerators. 9−3= Do not change the denominators. −3 9 __ − __ 3 = ____ 9 10 = 10 10 Simplify. 2. __ 16 − 16 = 3. __ 12 − 12 = 4. __ 14 − 14 = 7 6 __ 5. indd 33 33 1/18/11 3:32 PM Name Date Subtracting Fractions with Unlike Denominators Subtracting fractions with unlike denominators requires that you first convert fractions so that they have the same denominator. Rules for Subtracting Fractions with Unlike Denominators 1. First the least common denominator of the fractions.