Multiplying a 3 Digit Number by a 1 Digit

NumberUsing a Standard Written Method

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For example 397 x 4:Set the question out like

this:H T U

3 9 7

4xFirst, multiply 4 x 7 = 28

Th

For example 397 x 4:Set the question out like

this:H T U

3 9 7

4xFirst, multiply 4 x 7 = 28The 8 is written in the units column.8

Th

For example 397 x 4:Set the question out like

this:H T U

3 9 7

4xFirst, multiply 4 x 7 = 28The 8 is written in the units column.The 2 is carried into the tens column & written under the answer bar 2

8

Th

For example 397 x 4:Set the question out like

this:H T U

3 9 7

4x

2

8

Th

Then, multiply 4 x 9 = 36 This is added to the 2 that was carried into the tens column previously, to give a total of 38.

For example 397 x 4:Set the question out like

this:H T U

3 9 7

4x

2

8

Th

Then, multiply 4 x 9 = 36 This is added to the 2 that was carried into the tens column previously, to give a total of 38. The 8 is written in the tens column.

8

For example 397 x 4:Set the question out like

this:H T U

3 9 7

4x

2

8

Th

Then, multiply 4 x 9 = 36 This is added to the 2 that was carried into the tens column previously, to give a total of 38. The 8 is written in the tens column. The 3 is carried into the hundreds column & written under the answer bar

83

For example 397 x 4:Set the question out like

this:H T U

3 9 7

4x

2

8

Th

Then, multiply 4 x 3 = 12 This is added to the 3 that was carried into the hundreds column previously, to give a total of 15. 8

3

For example 397 x 4:Set the question out like

this:H T U

3 9 7

4x

2

8

Th

Then, multiply 4 x 3 = 12 This is added to the 3 that was carried into the hundreds column previously, to give a total of 15. The 5 is written in the hundreds column.

83

5

For example 397 x 4:Set the question out like

this:H T U

3 9 7

4x

2

8

Th

Then, multiply 4 x 3 = 12 This is added to the 3 that was carried into the hundreds column previously, to give a total of 15. The 5 is written in the hundreds column. The 1 is written in the thousands column.

83

51

For example 397 x 4:Set the question out like

this:H T U

3 9 7

4x

2

8

Th

83

51So, 397 x 4 = 1588

For example 397 x 4:Set the question out like

this:H T U

3 9 7

4x

2

8

Th

83

51So, 397 x 4 = 1588

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