
For example 74-40. The children should know that 40 is 4 tens so 70-40=30 and 74-40=34. You could also try counting forwards and backwards in 10s and in 1s over tricky boundaries: Count back 7 from 52. Next week we will be revising our formal methods for addition and subtraction and also counting on or back from a given number.
No comments:
Post a Comment