Maths Support Autumn 1 Week 3

Next week, the children will be looking at addition and subtraction. In particular, the children will be adding and subtracting numbers mentally with increasing larger numbers.

Adding in your head

  • Breaking up numbers

    40 + 67 is the same as
    40 + 60 + 7, which is
    107

  • Rounding numbers

    42 + 89 is the same as
    (40 + 80) + (2 + 9), which is
    120 + 11, which isĀ 131

  • Subtracting in your head
    1. Breaking up numbers
      63 – 37 is the same as 63 – 30 – 7
      63 – 30 = 33
      33 – 7 = 26
    2. Rounding numbers
      63 – 37 is the same as 63 – 40, then adding 3
      63 – 40 = 23
      23 + 3 = 26
    3. Counting on
      To work out 63 – 37, count on from 37 to 63
      Count on from 37 to 40 to get 3
      Count on from 40 to 60 to get 20
      Count on from 60 to 63 to get 3
      3 + 20 + 3 = 26

      Subtraction: 37 +3 = 40 + 20 = 60 + 3 = 63

You can have a go at the following games to practice adding and subtracting numbers mentally from the following website.

https://mathsframe.co.uk/en/resources/category/400

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