Decimals Worksheet - Unit 3 Page 20
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38So, 4.92
3
1.64
Each frog travelled 1.64 m.
® Luc’s frog travelled 16.64 m in 4 jumps.
About how far did the frog travel in 1 jump?
Divide: 16.64
4
• Dominique used a strategy for dividing 2 whole numbers,
then used front-end estimation to place the decimal point.
She used repeated subtraction to divide.
4
1
6
6
4
–
4
0 0
1
0 0
1
2
6 4
–
4 0 0
1 0 0
8 6 4
–
4
0 0
1 0 0
Write 16.64 as 16.
4 6 4
–
4
0 0
1 0 0
16
4
4
6 4
Dominique placed the decimal
–
4
0
1 0
point in the answer so the whole
2
4
–
2
4
6
number part is a number close
0 4 1 6
to 4; that is: 4.16
So, 16.64
4
4.16
We can use multiplication
to check:
• Marcel used a strategy for dividing 2 whole numbers,
4.16
4
16.64
then used estimation to place the decimal point.
So, the answer is correct.
To divide: 1664
4
Marcel broke 1664 into numbers that he could divide easily by 4.
1664
1000
600
64
1000
4
100 tens
4
600
4
60 tens
4
64
4
16
25 tens
15 tens
250
150
So, 1664
4
250
150
16
416
Marcel estimated to place the decimal point.
Since 16.64 is about 16, and 16
4
4, he placed the decimal point
between the 4 and the 1.
So, 16.64
4
4.16
Luc’s frog travelled about 4.16 m in 1 jump.
105
Unit 3 Lesson 5
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