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Written multiplication can be done step-by-step by setting out the calculation carefully and remembering to carry numbers if necessary.
Example
Work out
78 × 7
Answer
Rewrite the calculation vertically, like this:
Multiply the numbers in the ones column together, so 8 × 7 = 56.
Write the 6 in the ones column and carry the 5 tens below on to the doorstep of the tens column.
Next, multiply the numbers in the tens column together, so 7 × 7 = 49 and add the 5 that was on the doorstep.
This gives us 49 + 5 = 54, so we write the 4 in the tens column and the 5 in the hundreds column.
So 78 × 7 = 546
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Question
/ 10Mr Shepherd
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Teacher explanation