1. An alternative subtraction algorithm

2. In order to subtract, the top number must be larger than the bottom number 9 3 2 - 3 5 6 To make the top number in the ones column larger than the bottom number, borrow 1 ten. The top number in the ones column becomes 12 and the top number in the tens column becomes 2 (tens). 12 2 To make the top number in the tens column larger than the bottom number, borrow 1 hundred. The top number in the tens column becomes 12 (tens) and the top number in the hundreds column becomes 8 (hundreds). 12 8 Now subtract column by column in any order 5 6 7

3. Let’s try another one together 7 2 5 - 4 9 8 15 To make the top number in the ones column larger than the bottom number, borrow 1 ten. The top number in the ones column becomes 15 (ones) and the top number in the tens column becomes 1 (ten). 15 1 To make the top number in the tens column larger than the bottom number, borrow 1 hundred. The top number in the tens column becomes 11 (tens) and the top number in the hundreds column becomes 6 (hundreds). 11 6 Now subtract column by column in any order 2 7 2

4. Now, do this one on your own. 9 4 2 - 2 8 7 12 3 13 8 6 5 5

5. Last one! This one is tricky! 7 0 3 - 4 6 9 13 9 6 2 4 3 10