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# Multiply by Powers of 10

Multiply by Powers of 10

We will Multiply by a Power of 10 greater than 1.

Examples

1). 5.98 X 10,000

5.98 X 10,000: 10,000 has 4 zeros so we need to move the decimal point 4 places to the right.

= 59,800

We will multiply by a Power of 10 less than 1.

2). 93.6 X 0.1

93.6 X 0.1: 0.1 has one place after the decimal point so we need to move the decimal point one place to the left.

= 9.36

Notice when you multiply by a power of 10 greater than 1 it makes the product bigger:

 Decimal Power of 10 Product 2.72 x      1 2.72 2.72 x      10 27.2 2.72 x      100 272 2.72 x      1000 2,720 2.72 x      10,000 27,200

0.1= 1/10, 0.01= 1/100, 0.001= 1/1000

Notice that when you multiply by a power of 10 less than one, it makes the product smaller:

 Decimal Power of 10 Product 7.84 x    0.1 0.784 7.84 x    0.01 0.0784 7.84 x    0.001 0.00784

Activity: Ticket out the Door

Have students write a paragraph about what they learned. You can use this as an informal assessment.

Found on the Web:

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Powers of 10

Multiplying Powers of 10

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## Notes

### Figure This Challenge #56

• Complete Solution will be given on May 17, 2015

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Created by Wanda Collins May 10, 2015 at 1:56pm. Last updated by Wanda Collins May 10, 2015.

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# Math Limerick

Question: Why is this a mathematical limerick?

( (12 + 144 + 20 + 3 Sqrt[4]) / 7 ) + 5*11 = 92 + 0 .

A dozen, a gross, and a score,
plus three times the square root of four, divided by seven, plus five times eleven, is nine squared and not a bit more.

---Jon Saxton (math textbook author)

Presentation Suggestions:
Challenge students to invent their own math limerick!

The Math Behind the Fact:
It is fun to mix mathematics with poetry.

Resources:

Su, Francis E., et al. "Math Limerick." Math Fun Facts.

funfacts

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