Video: KS1-M17 • Paper 1 • Question 6

20 + 30 + 50 = _.

01:19

Video Transcript

20 add 30 add 50 equals what.

In this question, we have to add three numbers together. Each of these numbers ends in a zero, which means it’s a multiple of 10. 20 is two tens. 30 is three tens. And 50 is five tens. We know that two plus three makes five. So two tens plus three tens makes five tens. Two tens are 20. Three tens are 30. And five tens is 50.

Now we can just add together the two 50s. What is 50 plus 50? We know that five plus five is 10. So five tens, which is 50, plus five tens, which is another 50, equals 10 tens. 10 tens are 100.

20 plus 30 plus 50 equals 100.

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