Nine is very fast
All you do is multiply
By ten and then subtract.
What is 9 x 4?
(10 x 4) - (4)
40 - 4 = 36
Challenge:
What is 9 x 12?
What is 9 x 15?
Multiplying by
W
h
a
t
is
9
x
7
?
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Multiply by 10 first:
Then you subtract:
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10 x 7 = 70
70 - 7 = 63
v
Poster by Mr. Ooley’s 4th Grade Class
