Great maths from Year 1. They are all using number facts that they know to solve other problems.
If you know 4 + 3 = 7 then you also know 40 + 30 = 70
If you know 7 – 2 = 5. What is 70 – 20?
Why not tell Mrs. Whyman and explain to her how you know.
What other problems could you solve like this?