Adding two or three digit numbers – with regrouping

This animation (which you can find on “Maths Tools – Adding 3-digit numbers”) might help you to understand how regrouping works.

ADDING 3-digit numbers with regrouping

This works for 2-digit numbers, 4-digit numbers and so on…

Practise using this and challenging yourself using paper too, to see if you can do as well as the computer and get them correct.


Now you can also have a go at subtracting with regrouping.  Use this animation to see how it works.

SUBTRACTING 2-digit numbers with regrouping

This should feel much simpler for you now.


Adding Two-digit Numbers

In Rotating Maths Groups today, with Teacher you will be working on NA10 – written strategies for addition.

When you need to add two digit numbers, sometimes you have to regroup to bridge ten.   This activity shows you how, using MABs.


Now you should be able to use this  (and remember our Cheat Sheet) or Tens Frames to solve any addition problems.   😆