Vocabulary
To change the value of a number to one that is easier to work with.
round
6.5 x 104 =
65,000
Estimate:
51.2 x 4.2 =
200 or 204
3.8 is _____ of 38?
1/10
0.9 x 0.4 =
0.36
A number close to an exact value.
Estimate
8.3 x 102 =
830
Estimate:
11.8 x 75.5 =
912 or 800
0.45 is _____ of 45
1/100
0.5 x 0.6 =
0.30
The answer to a multiplication problem.
Product
6.7 x 105 =
670,000
Estimate by finding the range:
4.93 x 7.88 =
between 28 and 40
45 x 17 = 765
45 x 1.7 = _____
76.5
6.7 x 2.3 =
15.41
To divide or "break up."
partition
7.7 x 103 =
7,700
Estimate by finding the range:
7.77 x 10.8 =
Between 70 and 88
96 x 55 = 5,280
9.6 x 5.5 = ____
52.80 or 52.8
7.5 x 9 =
67.5
The answer when adding
1.2 x 101 =
12
Estimate by finding the range:
16.12 x 3.55 =
Between 48 and 68
1.9 x 42 = 79.8
1.9 x 4.2 = ____
7.98
$1.80 x 16 =
$28.80