# Divide by Powers of 10

Divide by Powers of 10

We will divide by powers of 10 greater than 1.

Examples:

Notice when the dividing by a power of 10 greater than 1, the quotient is less than the decimal:

 Decimal Power of 10 Quotient 15.8 /   1,000 0.0158 15.8 /    100 0.158 15.8 /    10 1.58

1. 6.743/ 100

100 has two zeros, so we have to move the decimal two places to the left.

= 0.06743

2. 3,142/1,000

1,000 has three zeros, so we have to move the decimal three places to the left.

= 3.142

We will divide by powers of 10 less than 1.

Notice when dividing by a power of 10 less than 1, the quotient is greater than the decimal.

 Decimal Power of 10 Quotient 15.8 /0.1 158 15.8 /0.01 1,580 15.8 /0.001 15,800

3. 0.02/0.1 - 0.1 has one decimal place, so we have to move the decimal one place to the right.

= 0.2

Activity: KWL Chart

Found on the Web:

PowerPoint:

Multiplying and Dividing by Powers of 10

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## Notes

### Figure This Challenge #56

• Complete Solution will be given on May 17, 2015

Complete Solution:

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

# 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.

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