Written Multiplication of Three-Digit Numbers by One-Digit

Written multiplication can be done step-by-step by setting out the calculation carefully and remembering to carry if necessary.

Example

Work out

947 × 7

Answer

Set out the calculation like this:

Then multiply the units together, so 7 × 7 = 49. 

Remember to carry the 4 tens below the next column.

Then multiply the tens, so 4 × 7 = 28 and add the 4 that was carried.

This gives us 28 + 4 = 32 , so we carry the 3 into the hundreds column and write the 2 in the tens column.

Then multiply the hundreds, so 9 × 7 = 63 and add the 3 that was carried.

This gives us 63 + 3 = 66 in the thousands.

So, in full, we have:

So      947 × 7 = 6629