ffirs.indd

190 Speed Math for Kids
76
× 34
24
7 × 4 = 28
3 × 6 = 18
28 + 18 + 2 carried = 48
76
× 34
4824
7 × 3 = 21 + 4 carried = 25
76
× 34
25 48 24
Each digit is multiplied by every other digit. Th e full calculation
looks like this:
76
× 34
25 48 24
Solving from right to left is probably easiest if you are using pen and
paper. If you want to solve the problem mentally, then you can go
from left to right. Let’s try it.
Th irty times 70 is 3 × 7 × 100. Th e 100 represents the two zeros
from 30 and 70.
3 × 7 = 21
21 × 100 = 2,100
I would say to myself, “Twenty-one hundred.”