This week we´ve been learning to subtract add tidy numbers , tidy numbers are each number going in 10s and 5s our teacher gave us equations to solve for eg; 51-___=18 or 50+____=88 so the strategy is round the nearest ten if subtracting which will go backwards so it will be 50 so -1 but going forward (adding) it will be 60 so +10.
You can do it by using number lines or just add it .It is just like adding to 10.
