How to Multiply and Divide Rational Numbers
To multiply rational numbers, multiply the numerators and multiply the denominators, then simplify: (2/3) × (−3/4) = −6/12 = −1/2. To divide, multiply by the reciprocal of the second number: (2/3) ÷ (4/5) = (2/3) × (5/4) = 5/6. The sign rules are the same as for integers: same signs give a positive answer, different […]
How to Solve Rational Numbers Word Problems
To solve a rational numbers word problem, decide which operation the story describes, convert all the numbers to one form (fractions or decimals), compute carefully with the sign rules, and check that the answer makes sense. For example, if a diver at −12.5 m rises 4.75 m, the new depth is −12.5 + 4.75 = […]
