Topic 4- Multiplying Decimals

Topic 4- Multiplying Decimals

Multiplying Decimals by Powers of 10

• What are the powers of 10? Which way do we move the decimal when we multiply by a power of 10?

• Solve: 3.45 x 10,000 = ?

• Solve: 0.34 x 10³ = ?

Estimating Products of a Decimal

• 2 Strategies: Rounding or compatible numbers

• Estimate the product: 34 x 1.93 = ?

• Estimate the product: 126 x 4.2 = ?

Multiplying Decimals by Whole Numbers

• 2 Strategies: Using fractions or number sense to place the decimal

• Solve using either strategy: 67 x 0.34 = ?

• Solve using either strategy: 14 x 0.123 = ?

Multiplying Decimals by Decimals

• MANY different strategies: Number sense, Models, Associative Property,

• Solve using any strategy: 1.45 x 8.3 = ?

• Solve using any strategy: 4.5 x 2.9 = ?