Basic Decimal Multiplication - Sample Math Practice Problems

The math problems below can be generated by MathScore.com, a math practice program for schools and individual families. References to complexity and mode refer to the overall difficulty of the problems as they appear in the main program. In the main program, all problems are automatically graded and the difficulty adapts dynamically based on performance. Answers to these sample questions appear at the bottom of the page. This page does not grade your responses.

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Complexity=1, Mode=1

Multiply. Sample Answers: 12.09   .76   0.76
1.
 0.1   × 0.4
2.
 1.5   × 1.1

Complexity=3, Mode=1

Multiply. Sample Answers: 12.09   .76   0.76
1.
 2.9   × 2.9
2.
 1.1   × 0.3

Complexity=5, Mode=1

Multiply. Sample Answers: 12.09   .76   0.76
1.
 4.4   × 5.1
2.
 1.5   × 2.5

Complexity=10, Mode=1

Multiply. Sample Answers: 12.09   .76   0.76
1.
 10.1   × 4.9
2.
 5.1   × 9

Complexity=1, Mode=1

Multiply. Sample Answers: 12.09   .76   0.76
1
 0.1   × 0.4
Solution
Ignore the decimals for now and multiply as usual.
```    01
× 04
4
00
4
```
Now add the decimal point back into the answer:
0.1 has 1 digit to the right of the decimal point and 0.4 has 1 digit to the right of the decimal point .
For the answer, put the decimal point 2 (1 + 1) places to the right of the answer.
So, the final answer is 0.04.
2
 1.5   × 1.1
Solution
Ignore the decimals for now and multiply as usual.
```    15
× 11
15
15
165
```
Now add the decimal point back into the answer:
1.5 has 1 digit to the right of the decimal point and 1.1 has 1 digit to the right of the decimal point .
For the answer, put the decimal point 2 (1 + 1) places to the right of the answer.
So, the final answer is 1.65.

Complexity=3, Mode=1

Multiply. Sample Answers: 12.09   .76   0.76
1
 2.9   × 2.9
Solution
Ignore the decimals for now and multiply as usual.
```    29
× 29
261
58
841
```
Now add the decimal point back into the answer:
2.9 has 1 digit to the right of the decimal point and 2.9 has 1 digit to the right of the decimal point .
For the answer, put the decimal point 2 (1 + 1) places to the right of the answer.
So, the final answer is 8.41.
2
 1.1   × 0.3
Solution
Ignore the decimals for now and multiply as usual.
```    11
× 03
33
00
33
```
Now add the decimal point back into the answer:
1.1 has 1 digit to the right of the decimal point and 0.3 has 1 digit to the right of the decimal point .
For the answer, put the decimal point 2 (1 + 1) places to the right of the answer.
So, the final answer is 0.33.

Complexity=5, Mode=1

Multiply. Sample Answers: 12.09   .76   0.76
1
 4.4   × 5.1
Solution
Ignore the decimals for now and multiply as usual.
```     44
× 51
44
220
2244
```
Now add the decimal point back into the answer:
4.4 has 1 digit to the right of the decimal point and 5.1 has 1 digit to the right of the decimal point .
For the answer, put the decimal point 2 (1 + 1) places to the right of the answer.
So, the final answer is 22.44.
2
 1.5   × 2.5
Solution
Ignore the decimals for now and multiply as usual.
```    15
× 25
75
30
375
```
Now add the decimal point back into the answer:
1.5 has 1 digit to the right of the decimal point and 2.5 has 1 digit to the right of the decimal point .
For the answer, put the decimal point 2 (1 + 1) places to the right of the answer.
So, the final answer is 3.75.

Complexity=10, Mode=1

Multiply. Sample Answers: 12.09   .76   0.76
1
 10.1   × 4.9
Solution
Ignore the decimals for now and multiply as usual.
```    101
× 49
909
404
4949
```
Now add the decimal point back into the answer:
10.1 has 1 digit to the right of the decimal point and 4.9 has 1 digit to the right of the decimal point .
For the answer, put the decimal point 2 (1 + 1) places to the right of the answer.
So, the final answer is 49.49.
2
 5.1   × 9
Solution
Ignore the decimals for now and multiply as usual.
```    51
× 9
459
```
Now add the decimal point back into the answer:
5.1 has 1 digit to the right of the decimal point and 9 has 0 digits to the right of the decimal point .
For the answer, put the decimal point 1 (1 + 0) places to the right of the answer.
So, the final answer is 45.9.