Decimal x Whole Number
2.5 x 5
12.5
3.12 x 7.8
24.336
3.19 x 100
319
0.2 x 0.4 =0.8
Forgot to insert a zero after the decimal to hold the place value. There were two digits after the decimal in the problem, so there should be two digits after the decimal in the answer.
3.7 x 2
7.4
3.62 x 1.4
5.068
45.6 x 1000
45,600
2.58 x 1000 = 258
They only moved the decimal twice instead of three times.
19.34 x 5
96.70
84.5 x 5.5
464.75
0.05 x 100
5
6.81 x 7 = 467.7
There were two digits after the decimal in the problem, so there should be two digits after the decimal in the product.
28 x 0.19
5.32
0.05 x 0.7
0.035
1.75 times ten to the zero power
1.75
6.34 x 5.2 = 32.966
They added the four and two instead of multiplying. The correct answer is 32.968
84 x 0.24
20.16
0.05 x 0.6
0.030 or 0.03
0.01 x 30
0.3
3.4 x 5.2 = 1768
There is no decimal! They forgot to put it back in the product.