Estimating Decimals
Multiplying Decimals
Powers of 10
Decimal Representations
100
1.9 x 2
4
100
Do you line up decimals when you multiply?
no
100
Solve
2.5 x 10
25
100
What decimal is represented in this picture?
0.4
200
50 x 2.5
150
200
Solve
1.32 x 2 =
2.64
200
Solve
100 x 36.99
3,699
200
What decimal is represented in this picture?
0.33
300
3.50 x 1.20
3
300
multiply
4.5 x .3 =
1.35
300
Solve
40.3 x 102
4,030
300
What is the product of this area model problem?
4.7
400
75.88 x 3.44 =
228
400
multiply
10.5 x .02 =
0.21
400
solve
3.36 x 0.1
0.336
400
What multiplication problem and product are represented in the model?
0.12 x 4 = 0.48
500
100.09 x 33.395 =
3,300
500
multiply
4.65 x 0.15
0.6975
500
75.25 x 0.001
0.07525
500
What multiplication problem and product are represented on the model?
0.2 x 0.5 = 0.10