Subtraction with Regrouping: 120 − 15

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 120 − 15?

Answer

120 − 15 =
105

With regrouping: 1 borrow — from the tens

120 − 15 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.
1+10
1 2(was 2, now 1)0 (was 0, now 10)
−15
105

Column by column: 120 − 15

  • Ones: 0 is less than 5 — borrow 1 ten: tens 2 → 1; 10 − 5 = 5 — write 5.
  • Tens: after borrowing, 1; 1 − 1 = 0 — write 0.
  • Hundreds: nothing to subtract — write 1.

120 − 15 = 105

Second check: 120 − 105 = 15

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Recalculate with different values ↑

Column subtractions of 15

ExampleDifference
86 − 1571
89 − 1574
91 − 1576
93 − 1578
98 − 1583
100 − 1585
104 − 1589
107 − 1592
109 − 1594
113 − 1598
120 − 15105
151 − 15136
187 − 15172
218 − 15203
254 − 15239
283 − 15268
322 − 15307
363 − 15348
391 − 15376
417 − 15402

FAQ

What is 120 − 15?

120 − 15 = 105

How do you check that 120 − 15 = 105?

Add the difference and the subtrahend: 105 + 15 = 120. Getting the minuend back means the difference is right.

How many times do you borrow in 120 − 15?

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

See Also