BACK 2 BASICS

what I learn was that a whole unknown is Two parts make up a whole and there is no meaningful difference between the two parts. There are only two types of questions and that is whole unknown and part unknown.

What I am good at is whole unknown because whole unknown includes the whole strategy. 

I need to work on my part unknown because I get can confusion a lot so I need to work on that.

add and subtract

WALT: add and subtract numbers up to 100 using tidy numbers

4+9+6+7+3+8+2+1=40

(9+1=10)(8+2=10)(6+4=10)(7+3=10)(10+10+10+10=40)