345-66

279

Short steps:

• 345 − 66 = 345 − 066
• Borrow for the units: 5 becomes 15, 15−6 = 9; tens become 3
• Borrow for the tens: 3 becomes 13, 13−6 = 7; hundreds become 2
• Hundreds: 2 − 0 = 2
• Result: 279

Want more practice problems like this? I can generate a few.