Over the year we have been doing all different subtraction strategies. We did jump strategy, regrouping, space invaders, making zero, and addition and subtraction are related. Some were hard but some were really hard. But once you got the hang of it was easy. You could be a expert and go compete in a math tournament.
– Jumps strategy -counting on – counting back
re grouping- algorithms – the biggest number goes first
space invaders – place value target – make to the next 10/100/1000
– making zero
Subtraction and addition are family. – check subtraction by adding.
I have learnt how to do a number line. The number line was probably the hardest thing to do because you had to put the small number first. If you didn’t it would be heaps harder.