176 Speed Math for Kids
(^1) + (^2) =
3 5
1 × 5 = 5
3 × 2 = 6
5 + 6 = 11
Eleven is the top number (the numerator) of the answer. Now
we multiply the bottom numbers (denominators) to fi nd the
denominator of the answer.
3 × 5 = 15
Th e answer is ⁄.
(^1) + (^2) = 5 + 6 (^) = 11
3 5 15 15
Easy.
Here is another example:
(^3) + (^1) =
8 7
Multiply crossways.
3 × 7 = 21
8 × 1 = 8
21 + 8
8 × 7
We add the totals for the numerator, which gives us 29. Th en we
multiply the denominators:
8 × 7 = 56
Th is is the denominator of the answer.
Our answer is ⁄
cc18.indd Sec1:176 18 .indd Sec 1 : 176 1/9/07 8:40:36 AM 1 / 9 / 07 8 : 40 : 36 AM