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Examples :: Math :: Example of Easy Multiplication

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# Example of Multiplication

Multiplying by 10

Multiply any number by 10 is easy, simply multiply by 1 and add Zero at the end OR move the decimal point one space to the right. For example, 83.45 * 10 = 834.5

• 10 * 1 is 10
• 10 * 2 is 20
• 10 * 3 is 30
• 10 * 4 is 40
• 10 * 5 is 50
• 10 * 6 is 60
• 10 * 7 is 70
• 10 * 8 is 80
• 10 * 9 is 90
• 10 * 10 is 10
• 10 * 11 is 110
• 10 * 12 is 120

Multiplying by 100

To multiply a number by 100 is easy, just add 00 after the number OR move the decimal point to two spaces right 789.568 * 100 =78956.8

• 100 * 1 is 100
• 100 * 2 is 200
• 100 * 3 is 300
• 100 * 4 is 400
• 100 * 5 is 500
• 100 * 6 is 600
• 100 * 7 is 700
• 100 * 8 is 800
• 100 * 9 is 900
• 100 * 10 is 100
• 100 * 11 is 1100
• 100 * 12 is 1200

Multiplying two digit by one digit numbers

• First line up the numbers as per the place value (all the tens and the units lined up vertically). Put a line under the last number.
• ```52
3
```
• Multiply the numbers in ones place (2 * 3 = 6). Write the answer in the ones place column.
• ```52
3
6
```
• Multiply the number in the tens place column (5) by the number in the lower ones place column (3). The answer is 5 * 3 = 15. Write the answer below the line in the tens place column.
• ``` 52
3
156```

Multiplying two digit by one digit numbers

How to multiply a two-digit number by a one-digit number?

• First line up the numbers as per the place value (all the tens and the units lined up vertically). Put a line under the last number.
• ```78
5
```
• Multiply the two ones digit numbers (8 * 5 = 40). This result is greater than 9, so write the 4 above the tens place value and write the 0 under the line in the ones place column.
• ```4
78
5
0
```
• Multiply the digit in the tens place column (7) by the lower ones place digit (5). The result is 7 * 5 = 35. Add 4 to 35 (35 + 4 = 39) and write the answer under the line and to the left of the 3.
• ``` 4
78
5
390
```

Multiplication of Two and Three Digit Numbers

How to multiply a three-digit number by a two-digit number (e.g. 649 * 76)?

• First line up the numbers as per the place value (all the hundreds, tens and the ones lined up vertically). Draw a line under the last number.
• ```649
76
```
• Multiply the numbers in ones place. (9 * 6 = 54). The result 54 is greater than 9 so write a 5 above the tens place value and write 4 under the line in the ones place column
• ```  5
649
76
4
```
• Multiply the digit in the tens place column that is 4 by the number in the lower ones place column that is 6. The result is (4*6=24). Now Add 5 to 24 (24 + 5 = 29) and write 9 in the tens place column below the line and 2 above the hundreds place column.
• ``` 25
649
76
94
```
• Multiply the digit in the hundreds place column (6) by the number in the lower ones place column (6). The result is (6*6=36). Now Add 2 to 36 (36 + 2 = 38) and write 38 under the line to the left of 9.
• ``` 25
649
76
3894
```
• After 649 has been multiplied by 6 as shown above, 649 is multiplied by the number in the lower tens'' place, which is 7. The number is shifted one place to the left because we are multiplying by a tens' place value. The result will be 4543:
• ```   25
649
76
3894
4543
```
• Draw a line under the lower product (4543) and the products are now added together to get the final result of 49324.
• ```   25
649
76
3894
4543
49324
```

Multiplying three digit by one digit numbers

How to multiply a three-digit number by a one-digit number (e.g. 524 * 2)?

• First line up the numbers as per the place value (all the tens and the units lined up vertically). Put a line under the last number.
• ```524
2
```
• Multiply the numbers in the ones place (4 * 2 = 8). Write the 8 under the line in the ones place column.
• ```524
2
8
```
• Multiply the number in the tens place column that is 2 by the number in the lower ones place number that is 2. The result is 2 * 2 = 4. Write the answer under the line and to the left of the 8.
• ```524
2
48
```
• Multiply the number in the hundreds place column that is 5 by the lower tens place number which is 2. The result is 5 * 2 = 10. Write the 10 under the line in the hundreds'' place column.
• ``` 524
2
1048
```

Multiplication facts for 0, 1, 2 and 3

If any number is multiplied by 0, answer is 0.

If any number is multiplied by 1, answer is that number.

Multiplying by 2 and 3
 TWO 0*2=0 1*2=2 2*2=4 3*2=6 4*2=8 THREE 0*3=0 1*3=3 2*3=6 3*3=9 4*3=12
Multiplication using a Calculator

How to multiply two numbers (for example 46 * 78) with a calculator?

• Type the first number by pressing the 4 button and the 6 button.
• Press the * operation button.
• Type the number 78 by pressing the 7 button and the 8 button.
• Press the = button to get the result.

Try some yourself:

Exercise 1

1. 143 * 8 =
2. 434 * 233 =
3. 767 * 5 =
4. 555 * 245 =
5. 7878 * 98 =
6. 6578 * 10 =
7. 56 * 5 =
8. 2323 * 57 =
9. 888 * 321 =
10. 567 * 38 =