134-123

Answer: 11

Reason (quick method): 134 − 123

• Units: 4 − 3 = 1
• Tens: 3 − 2 = 1
• Hundreds: 1 − 1 = 0

So the result is 0 1 1, i.e., 11. Quick check: 123 + 11 = 134. If you want, I can give more practice problems.