Maths. Subtraction

WALT: Solve the subtraction problems using place value partitioning.

1.952-259=

12-9=3

140-50=90

800-200=600

600+90+3=693

This is how I worked it out.

I can not take away 9ones from 2ones so I borrow one ten from 5tens now I got 12 and 12-9=3

Since I borrow a ten from the 5tens now I got 4tens. I can not take away 5tens from 4tens so I borrow one hundred from 9hundred and now I got 140 and 140-50=90

I took away 200 from 800 and I was left with 600 so 600+90+3=693.