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What's Next 1 - Solution

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1, 3, 6, 10, 15, 21, 28

Do you see why?

We added 2 to get from the 1 to the 3...

We added 3 to get from the 3 to the 6...

We added 4 to get from the 6 to the 10...

We added 5 to get from the 10 to the 15...

We added 6 to get from the 15 to the 21...

Do you see the pattern in the green numbers?

So, we added 7 to get from the 21 to the 28...