Maths

In Room 12 we have been learning about reversibility in maths.

For example
112 - 95 =
95 +     = 112
95 + 5 = 100
100 + 12 = 112

I recon it is good to know lots of maths strategies not just one, especially reversibility so if you come across a hard subtraction you will know how to turn it into a addition.

Solve these in the comments
1:  64 - 38 =          2:  93 - 57 =         3:  243 - 226 =         4:  871 - 818 =

By Kate Hindle