5 Th Grace Unit 1: Place Value And Powers Of 10 Understanding Pre-Assessment Page 3

16.

Explain why the following multiplication problem with powers of 10 is true.

(Patterns in the number of zeros of the product when multiplying a number by powers of 10)

432×10

=432000

4.32×10

=432

43.2×10

=432

17.

Is 50 x 600= 3,000 correct or incorrect? Prove your answer.

(Patterns in the number of zeros of the product when multiplying a number by powers of 10)

18.

A marker costs $0.15

How much will 10 markers cost?

How much will 100 markers cost?

How much will 1,000 markers cost?

Explain the pattern you notice with your answers above.

(Patterns in the number of zeros of the product when multiplying a number by powers of 10)

19.

How can you use what you know about multiplying by powers of 10 to help you find

4 x 23 x 25?

(Patterns in the number of zeros of the product when multiplying a number by powers of 10)

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