Eleven is a ten and a
one, just times ten then
add times one
What is 11x9?
(10 x 9) + (1 x 9) =
90 + 9 = 99
Challenge:
What is 11 x 7?
11 x 13?
Multiplying by
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Multiply by 10, then multiply by 1 and add together.
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10 x 8 = 80
1 x 8 = 8
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+
=
W
h
a
t
i
s
1
1
x
8
?
Poster by Mr. Ooley’s 4th Grade Class 2005—2006
