Multiply decimal tenths
The idea
Estimate the product to decide approximately how large it should be.
Step by step
- Estimate the product to decide approximately how large it should be.
- Multiply the whole-number counts of tenths; a tenth times a tenth is one hundredth.
- Write the result in hundredths and compare it with the estimate.
Example
Find 1.2 × 0.3.
Answer
0.36
1.2 is 12 tenths and 0.3 is 3 tenths. Their product is 36 hundredths, or 0.36.
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5 questionsTry it together
Draw a 10-by-10 grid to model 0.3 × 0.4. Explain why twelve shaded small squares represent 0.12.
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