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Let’s ReviewLet’s Review
Hundreds
Tens Ones
2 groups of ten = 20
3 single units = 3
1 group of 100 = 100
Ones
Hundreds Tens Ones
1 2 3
Let’s ReviewA Common Mistake
Forgetting to take the decimal into consideration when multiplying.
0.3 x 0.5 ≠ 15
Let’s ReviewCore Lesson Smart Estimate0.5 x 0.3
0.5 is
of is
Smart estimate: A little more than 0.1
≈ 0.1
is close to
0.3 x 0.5
≈ 0.2 = x 0.5
Let’s ReviewCore Lesson
Ones Tenths
Hundredths
0 1 5
This is a reasonable
answer since it is close to my
smart estimate
0.5 x 0.3
=
Let’s ReviewCore Lesson
Susanna has 0.4 of a box of paper, but she promised to share 0.5 of it with her friend. How
much paper will she have?
0.5 is
of is Smart estimate is 0.20.4
x 0.5
Let’s ReviewCore Lesson
Ones Tenths
Hundredths
0 2 0
This is a reasonable
answer since it matches my
smart estimate
0.4 x 0.5
=
Let’s ReviewExtension Activities
0.5 x 0.7 is 0.35. Explain why the product of these two decimals is smaller thank he two multipliers. Use an area model to help you explain.
Let’s ReviewExtension Activities
What is 0.3 x 0.4? How would the answer be different if the problem was 0.3 x 0.04?