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Estimating
Number Sense
Multiplying a Decimal by a Whole Number
Multiplying by Powers of 10
Multiplying a Decimal by a Decimal
100
Estimate the product. 1.3 x 2.1
What is 2
100
8.5 x .45 = 3825
What is 3.825
100
2.3 x 2
What is 4.6
100
2.3 x 10
What is 23
100
2.6 x 3.4
What is 8.84
200
Estimate the product. 4.7 x 2.6
What is 15
200
10.36 x 9.5 = 9842
What is 98.42
200
25.8 x 3
What is 77.4
200
26.4 x 100
What is 2640
200
4.5 x 8.2
What is 36.9
300
12.3 x 1.7
What is 24
300
Correct or Incorrect? 8.1 x 4.2 = 34.02
What is Correct
300
6.4 x 9
What is 57.6
300
957.36 x 10
What is 9,573.6
300
12.3 x 2.7
What is 33.21
400
9.4 x 8.1
What is 72
400
Correct or Incorrect? 6.98 x 4.2 = 293.16
What is Incorrect 29.316
400
9.5 x 12
What is 114
400
542.32 x 100
What is 54,232
400
1.65 x 4.2
What is 6.93
500
4.6 x 0.35
What is 0
500
Correct or Incorrect? 2.6 x 4.9 = 127.4
What is Incorrect 12.74
500
34.6 x 4
What is 138.4
500
1.689 x 1,000
What is 1,689
500
0.35 x 8.9
What is 3.115