Speed Math by Gaurav Tekriwal

Author:Gaurav Tekriwal
Language: eng
Format: epub
Publisher: DK Publishing
Published: 2014-01-06T16:00:00+00:00

Solution: The answer is .

QUICK TIP

Whether it’s on paper or in your head, right after you change the sign from division to multiplication, flip the numerator and denominator on the second fraction. That way, you’ll keep those two processes connected.

Example 2

Solve the problem .

Step 1: Change the division sign to a multiplication sign and reverse the second fraction so 7 is on top and 90 is on the bottom.

Step 2: Simplify the fractions crosswise and multiply. In this case, 90 goes into 45 twice, so 45 becomes 1 and 90 becomes 2; 18 and 7 can’t reduce.

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