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(**) Multiplying Two
Numbers Greater Than 1000, But Close To 1000:
A. From algebra we learn:
(1000 + a) (1000
+ b) = 1000(1000 + a + b) + ab
B. Using numbers instead of
variables we get the following:
1.
Multiply the one’s digits together.
Write this number down (make sure that it takes up 3 place values).
2.
Add the one’s digits together. Write
this number down (make sure that it takes up 3 place values).
3.
Write 1.
Ex [1] 1007 x 1004 =_________.
a)
7 x 4 = 28. Write 028 to
take up 3 place values.
b)
7 + 4 = 11. Write 011 to
take up 3 place values.
c)
Write 1.
d)
The answer is 1011028.
Ex [2] 10132 =_________.
a)
13 x 13 = 169. Write 169.
b)
13 + 13 = 26. Write 026 to
take up 3 place values.
c)
Write 1.
d)
The answer is 1026169.
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