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Multiply and Divide Numbers Ending in Zeros
Worksheet
Grade Level
Grade 5
5.22 Multiply and Divide Numbers Ending in Zeros
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🔴 Hard
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Ben says 70,000 × 900 = 63,000,000. Which statement best justifies the answer using place-value language and an estimation check?
A
Rewrite 70,000 = 7 × 10,000 and 900 = 9 × 100; then (7×9)×1,000,000 = 63,000,000. An estimate 7×9 with 6 zeros supports it.
B
Multiply 7×9=63 and add only 5 zero(s), because one zero “doesn’t count” when you multiply.
C
Add the numbers of zeros to the product of the whole numbers: 70,000×900 is about 70,900 with zeros.
D
Use addition: since both numbers end in zeros, you can add 70,000+900 and keep the zeros to get the product.
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