Answer Key
Name:
Placing Decimals with Multiplication
Determine the placement of the decimal in each product.
A n s w e r s
4
5
3
1
0
2
5.809 × 7.8 =
24.88896
1.
1. Count the quantity of numbers to the right of the
2. Add the amounts together. Your answer
decimal for each factor.
should have the same quantity of numbers
to the right of the decimal.
26.487
5.809 has 3 numbers right of the decimal (5.809)
2.
3 + 1 = 4
7.8 has 1 number right of the decimal (7.8)
5.089 (3) × 7.8 (1) = 45.3102 (4)
15.8857
3.
Also notice that 5 × 7 = 35 and 6 × 8 = 48 , so 5.809 × 7.8 will be a more than 35 but less than 48.
21.774
4.
.
1) 4.321 × 5.76 =
2
4
8
8
8
9
6
6.17
5.
.
2) 9 × 2.943 =
2
6
4
8
7
48.5
.
6.
3) 2.371 × 6.7 =
1
5
8
8
5
7
.
29.3229
4) 3 × 7.258 =
2
1
7
7
4
7.
.
5) 1 × 6.17 =
6
1
7
26.0
8.
.
6) 5 × 9.7 =
4
8
5
3.025
9.
.
7) 3.1 × 9.459 =
2
9
3
2
2
9
27.82175
.
10.
8) 5 × 5.2 =
2
6
0
.
21.9032
9) 2.5 × 1.21 =
3
0
2
5
11.
.
10) 3.685 × 7.55 =
2
7
8
2
1
7
5
47.87212
12.
.
11) 2.882 × 7.6 =
2
1
9
0
3
2
52.1565
13.
.
12) 6.898 × 6.94 =
4
7
8
7
2
1
2
48.10230
.
14.
13) 5.995 × 8.7 =
5
2
1
5
6
5
.
46.26
14) 8.55 × 5.626 =
4
8
1
0
2
3
0
15.
.
15) 6 × 7.71 =
4
6
2
6
13.9980
16.
.
16) 9.332 × 1.5 =
1
3
9
9
8
0
13.04940
17.
.
17) 1.95 × 6.692 =
1
3
0
4
9
4
0
19.0875
18.
.
18) 7.635 × 2.5 =
1
9
0
8
7
5
.
69.150
19) 9.22 × 7.5 =
6
9
1
5
0
19.
.
20) 1.9 × 1.16 =
2
2
0
4
2.204
20.
1-10 95 90 85 80 75 70 65 60 55 50
3
Math
11-20 45 40 35 30 25 20 15 10 5
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