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 is 131  Subtracting in your head

 Breaking up numbers
63 – 37 is the same as 63 – 30 – 7
63 – 30 = 33
33 – 7 = 26  Rounding numbers
63 – 37 is the same as 63 – 40, then adding 3
63 – 40 = 23
23 + 3 = 26  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
 Breaking up numbers
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