Video: KS2-M16 • Paper 1 • Question 10

879 × 2 = ＿.

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Video Transcript

879 multiplied by three equals what?

One way to calculate the answer would be to partition 879 into 800, 70, and nine and then multiply each part by three. We know that eight times three is 24. 800 times three is 2400. We know that seven times three is 21. So 70 times three is 210. And nine times three is 27.

Now all we need to do is add together each part to give us the answer. Zero plus zero [Zero plus zero plus seven] is seven. Zero plus one plus two is three. Four plus two is six. And there’s nothing to add to the two in this column. So the answer is two. 879 multiplied by three is 2637.

We could also calculate the answer using a written method. Nine times three is 27. We can write the seven in the ones column and exchange the 20 for two tens. Next, we need to calculate seven times three, which is 21, plus the two, which makes 23. And eight times three is 24, plus the two is 26. Both methods give us the correct answer of 2637.