Multiply a Number by a Power of 10

What is the pattern you observe in decimal placement when you multiply or divide by a power of 10. Choose the BEST answer.

• When you multiply by a power of 10 your number decreases in value because you move the decimal to the left and when you divide by a power of 10 your number increases in value because you move the decimal to the right.

• When you multiply by a power of 10 you move the decimal to the right and the number increases (gets bigger) in value. When you divide by a power of 10 you move the decimal to the left and the number decreases (gets smaller) in value.

• When you multiply by a power of 10 your number gets bigger. When you divide by a power of ten your number gets smaller.

• When you multiply by a power of 10 you move the decimal to the right. When you divide by a power of 10 you move the decimal to the left.

If your divisor has a decimal, you must first multiply it by a power of 10 to make it a whole number. (Then multiply the dividend by the same amount.)

• True

• False

45 ÷ 10¹

• .045

• .45

• 45

• 4.5

This is a number like 10, 100, 1000, and so on. It is the result of using only 10 as a factor.

Hannah multiplies 0.542 by powers of 10.

By what power of 10 would Hannah multiply 0.542 to get a product of 5,420,000?

• 10⁵

• 10⁶

• 10⁷

• 10⁸

• A

• B

• C

• D

• A

• B

• C

• D

How many zeros are in the product of 540 x 10

• 2

• 3

• 4

• 5

• 80,000

• 8,000

• 800

• 320

• A

• B

• C

• D