1. Decomposition Take away method

2. Here is the problem: 472- 169=??????

3. 1- partition your numbers 472= 400 + 70 + 2 169= 100 + 60 + 9

4. 2- Line up your partitioned numbers into the same column values ◦HTU◦HTU 400702 - 100609 You can’t take 2 away from 9!

5. 3- Decompose if you need to! If you decompose a number, always make sure it still adds up to the original number. I’m going to transfer a ten across to the units column to allow me to carry out the subtraction.  400 + 60 + 12 = (still equals) 472 One TEN has moved across

6. 4- Subtract each column ◦HTU◦HTU -4006012 100609 300 0 3

7. 5- Add your answers together ◦HTU◦HTU -4006012 100609 300 0 3 303