Subtraction with Regrouping: 123 − 34

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 123 − 34?

Answer

123 − 34 =
89

With regrouping: 2 borrows — from the tens and the hundreds

123 − 34 in a column. Above the columns: the values after borrowing — a crossed-out digit is replaced by the number above it; +10 marks a column that received a borrowed ten.
011+10
1(was 1, now 0)2(was 2, now 11)3 (was 3, now 13)
−34
89

Column by column: 123 − 34

  • Ones: 3 is less than 4 — borrow 1 ten: tens 2 → 1; 13 − 4 = 9 — write 9.
  • Tens: after borrowing, 1; 1 is less than 3 — borrow 1 hundred: hundreds 1 → 0; 11 − 3 = 8 — write 8.
  • Hundreds: after borrowing, 0 — a leading zero is not written.

123 − 34 = 89

Second check: 123 − 89 = 34

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Column subtractions of 34

ExampleDifference
97 − 3463
99 − 3465
101 − 3467
103 − 3469
105 − 3471
108 − 3474
110 − 3476
112 − 3478
117 − 3483
119 − 3485
123 − 3489
126 − 3492
128 − 3494
132 − 3498
139 − 34105
170 − 34136
206 − 34172
237 − 34203
273 − 34239
302 − 34268

FAQ

What is 123 − 34?

123 − 34 = 89

How do you check that 123 − 34 = 89?

Add the difference and the subtrahend: 89 + 34 = 123. Getting the minuend back means the difference is right.

How many times do you borrow in 123 − 34?

2 borrows: each time the top digit was smaller than the one below it, 1 was borrowed from the column on the left.

See Also