Subtraction with Regrouping: 122 − 17

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 122 − 17?

Answer

122 − 17 =
105

With regrouping: 1 borrow — from the tens

122 − 17 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)2 (was 2, now 12)
−17
105

Column by column: 122 − 17

  • Ones: 2 is less than 7 — borrow 1 ten: tens 2 → 1; 12 − 7 = 5 — write 5.
  • Tens: after borrowing, 1; 1 − 1 = 0 — write 0.
  • Hundreds: nothing to subtract — write 1.

122 − 17 = 105

Second check: 122 − 105 = 17

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Recalculate with different values ↑

Column subtractions of 17

ExampleDifference
88 − 1771
91 − 1774
93 − 1776
95 − 1778
100 − 1783
102 − 1785
106 − 1789
109 − 1792
111 − 1794
115 − 1798
122 − 17105
153 − 17136
189 − 17172
200 − 17183
220 − 17203
256 − 17239
285 − 17268
300 − 17283
324 − 17307
365 − 17348

FAQ

What is 122 − 17?

122 − 17 = 105

How do you check that 122 − 17 = 105?

Add the difference and the subtrahend: 105 + 17 = 122. Getting the minuend back means the difference is right.

How many times do you borrow in 122 − 17?

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