Subtraction with Regrouping: 109 − 15

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 109 − 15?

Answer

109 − 15 =
94

With regrouping: 1 borrow — from the hundreds

109 − 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.
0+10
1(was 1, now 0)0 (was 0, now 10)9
−15
94

Column by column: 109 − 15

  • Ones: 9 − 5 = 4 — write 4.
  • Tens: 0 is less than 1 — borrow 1 hundred: hundreds 1 → 0; 10 − 1 = 9 — write 9.
  • Hundreds: after borrowing, 0 — a leading zero is not written.

109 − 15 = 94

Second check: 109 − 94 = 15

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Recalculate with different values ↑

Column subtractions of 15

ExampleDifference
82 − 1567
84 − 1569
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

FAQ

What is 109 − 15?

109 − 15 = 94

How do you check that 109 − 15 = 94?

Add the difference and the subtrahend: 94 + 15 = 109. Getting the minuend back means the difference is right.

How many times do you borrow in 109 − 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