What must be added?

Adding on to the next whole hundred, and then on to the next whole thousand.

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Adding a single digit to a 3-digit number; there might well be plenty of counting on fingers here!

Without using paper and pencil practise adding three small numbers as well as adding two 2-digit numbers.

Harder mental addition, using all the skills and strategies learned so far.

Once the technique for adding 9 to a number has been mastered, there is no problem with adding 19, 29 or 39!