Next Door Additions in Y3

Here’s a Maths Problem we recently investigated in Year 3.

1. Use expanded addition or column addition to work out 123 + 234

2.  Add the digits from your answer 375: 3 + 7 + 5 = 15 Then add the digits again so that you get a single-digit answer.

1 + 5 = 6   This is called finding the digital root.

3.  Now repeat with 234 + 345    and then 345 + 456 and so on. Can you see what is special about each pair of numbers?

4. What do you notice about the digital roots of the answers?

What happens if you try pairs of numbers like 987 + 876 and 654 + 543?

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