Number and Operations in Base Ten

Subtracting within 100

Take one two-digit number away from another.

Taking away a big number is easier in two goes. Split both numbers into tens and ones, deal with each separately, then put the answer back together.

Worked example

What is 47 − 13?

  1. Split them up. 47 is 40 and 7. 13 is 10 and 3.

    Every two-digit number is just some tens and some ones.

Try it together

Your turn: 62 − 27

    1.The ones come first here. You cannot take 7 from 2, so break one ten open. What is 12 − 7?

    Watch out

    When the ones are too small to take from, break a ten open first. 62 is 6 tens and 2 ones, and it is also 5 tens and 12 ones.

    Have a go

    Have a go on your own: 54 − 26

    Hint: Break a ten, then start with 14 − 6.

    Ready to practice?

    Eight questions on what you have just read. Nothing is timed, and you can play as many times as you like.

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