Lesson 4.5 Multiplying and Dividing by Powers of 10.

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Presentation transcript:

Lesson 4.5 Multiplying and Dividing by Powers of 10. Goal: The learner will use mental math to multiply and divide.

What happens when you multiply by a power of 10? Whole Number Powers of Ten Decimal Powers of Ten 10 x 8.3 = 0.10 x 8.3 = 100 x 8.3 = 0.01 x 8.3 = 1000 x 8.3 = 0.001 x 8.3 = 10,000 x 8.3 = 0.0001 x 8.3 =

Multiplying by whole number powers of ten: Move the decimal point one point to the right for every zero. Multiplying by decimal powers of ten: Move the decimal point one point to the left for every zero. The Rules

0.05 x 1000 = 95.38 x 0.0001 =

The graph shows the number of vehicles that crossed bridges during 2000. How many vehicles crossed the Golden Gate Bridge?

Dividing by Powers of Ten Whole Number Powers: Move the decimal point to the left for each zero. Decimal Number Powers: Move the decimal point to the right for each zero. Dividing by Powers of Ten

508.3÷ 10 508.3 ÷ 0.01 Examples

Go to Classzone and complete the section 4.5 quiz under assessments.