Decimal multiplication and estimation

Estimate, choose a strategy, and solve!

Multiple Choice

Which is a good estimate for 4.2 x 3?

• 4 x 3 = 12

• 5 x 3 = 15

• 5 x 5 = 25

• 4 x 5 = 20

​​Area model

Partial products

Standard algorithm

Draw

Choose a strategy. Solve: 4.2 x 3 = p

Multiple Select

Which is a good estimate for 4.2 x 9?

• 5 x 9 = 45

• 4 x 9 = 36

• 4.2 x 10 = 42

• 4 x 5 = 20

​​Area model

Partial products

Standard algorithm

Draw

Choose a strategy. Solve: 4.2 x 9 = p