Question

5.NBT Elmer's Multiplication

Error
Task
This is Eimer's work on a multiplication problem
179
4. Use estimation to explain why Elmer's answer is not reasonable,
E. What error do you think Elmer made? Why do you think he made that error?
c. Find 179 x 64 using a correct version of Elmer's method. Then show another way of
coing it to help Elmer see why your answer is correct.

Answer 1

11456

Explanation:

Write it down like this.
179

x64

-----

1074 (4 x 9)

7160 (4 x 7, then 4 x 70)

10740 (4 x 1, then 6 x 6, then 4 x 100)
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=11456

(ALWAYS DOUBLE CHECK)