Answer: 1242

1. 9 − 7 = 2
2. 4 − 0 = 4
3. 9 − 7 = 2
4. 8 − 7 = 1

Answer: 3070

1. 5 − 5 = 0
2. 8 − 1 = 7
3. 3 − 3 = 0
4. 5 − 2 = 3

Answer: 796

1. 3 is less than 7: regroup 1 ten from the next column → 13 − 7 = 6
2. 3 is less than 4: regroup 1 ten from the next column → 13 − 4 = 9
3. 1 is less than 4: regroup 1 ten from the next column → 11 − 4 = 7
4. 3 − 3 = 0

Answer: 7950

1. 7 − 7 = 0
2. 7 − 2 = 5
3. 6 is less than 7: regroup 1 ten from the next column → 16 − 7 = 9
4. 8 − 1 = 7

Answer: 665

1. 7 − 2 = 5
2. 0 is less than 4: regroup 1 ten from the next column → 10 − 4 = 6
3. 2 is less than 6: regroup 1 ten from the next column → 12 − 6 = 6
4. 6 − 6 = 0

Answer: 1200

1. 3 − 3 = 0
2. 2 − 2 = 0
3. 5 − 3 = 2
4. 4 − 3 = 1

Answer: 2788

1. 6 is less than 8: regroup 1 ten from the next column → 16 − 8 = 8
2. 5 is less than 7: regroup 1 ten from the next column → 15 − 7 = 8
3. 8 − 1 = 7
4. 4 − 2 = 2

Answer: 1411

1. 6 − 5 = 1
2. 7 − 6 = 1
3. 4 − 0 = 4
4. 2 − 1 = 1

Answer: 2683

1. 5 − 2 = 3
2. 7 is less than 9: regroup 1 ten from the next column → 17 − 9 = 8
3. 0 is less than 4: regroup 1 ten from the next column → 10 − 4 = 6
4. 4 − 2 = 2

Answer: 2440

1. 0 − 0 = 0
2. 3 is less than 9: regroup 1 ten from the next column → 13 − 9 = 4
3. 6 − 2 = 4
4. 6 − 4 = 2

Answer: 107

1. 8 − 1 = 7
2. 7 − 7 = 0
3. 9 − 8 = 1
4. 2 − 2 = 0

Answer: 2046

1. 6 − 0 = 6
2. 5 − 1 = 4
3. 3 − 3 = 0
4. 3 − 1 = 2

Answer: 2074

1. 7 − 3 = 4
2. 5 is less than 8: regroup 1 ten from the next column → 15 − 8 = 7
3. 0 lent 1 to the column before, so regroup again: this column becomes 9 → 9 − 9 = 0
4. 7 − 5 = 2

Answer: 2665

1. 6 − 1 = 5
2. 5 is less than 9: regroup 1 ten from the next column → 15 − 9 = 6
3. 3 is less than 7: regroup 1 ten from the next column → 13 − 7 = 6
4. 6 − 4 = 2

Answer: 6452

1. 7 − 5 = 2
2. 3 is less than 8: regroup 1 ten from the next column → 13 − 8 = 5
3. 5 − 1 = 4
4. 9 − 3 = 6

Answer: 1448

1. 1 is less than 3: regroup 1 ten from the next column → 11 − 3 = 8
2. 7 − 3 = 4
3. 8 − 4 = 4
4. 5 − 4 = 1