Add 10 and the ones digit stays the same.
Adding tens: how do I help my child add 10 in their head? When you add 10, or any number of tens, to a 2-digit number, the ones digit stays the same and the tens digit goes up: 34 + 10 = 44. Most Year 2 classes are adding and subtracting tens and ones this half-term, often on a hundred square.
The method in words
On a hundred square:
+ 10 = one row down: 34 → 44
+ 30 = three rows down: 34 → 64
− 20 = two rows up: 56 → 36
The tip: use a fact your child knows. 3 + 3 = 6, so 30 + 30 = 60.
Sources: Oak National Academy, Year 2 lessons "Add and subtract 10 to and from a 2-digit number" and "Add multiples of 10 to 2-digit numbers"; national curriculum for maths, Year 2. Contains public sector information licensed under the Open Government Licence v3.0.
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