Decimals Worksheet - Unit 3 Page 15
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38When you multiply a decimal less than 1 by a whole number,
the product is less than the whole number.
You can use place value and estimation to multiply a decimal less than 1
by a 1-digit whole number.
® To multiply 0.9 by 2:
Ones
Tenths
Use Base Ten Blocks.
0.9
Model 2 groups of 0.9.
0.9 is nine tenths.
0.9
Nine tenths multiplied by 2 is 18 tenths.
Trade 10 tenths for 1 one.
1 one
8 tenths
1.8
Ones
Tenths
So, 0.9
2
1.8
® To multiply 0.15 by 4:
Use Base Ten Blocks.
Model 4 groups of 0.15.
0.15 is 15 hundredths, which is 1 tenth and 5 hundredths.
Ones
Tenths
Hundredths
Trade 10 hundredths
0.15
for 1 tenth.
0.15
Trade another 10 hundredths
0.15
for 1 tenth.
0.15
Ones
Tenths
Hundredths
0.60 is 60 hundredths,
which is 6 tenths.
0 ones
6 tenths
0 hundredths
0.60
So, 0.15
4
0.60
100
Unit 3 Lesson 4
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