Subtraction with Regrouping: 100 − 12

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 100 − 12?

Answer

100 − 12 =
88

With regrouping across a zero: 2 borrows — there are no tens to borrow from, so 1 hundred becomes 10 tens, and 1 ten goes to the ones

100 − 12 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.
09+10
1(was 1, now 0)0(was 0, now 9)0 (was 0, now 10)
−12
88

Column by column: 100 − 12

  • Ones: 0 is less than 2 — borrow 1 hundred across the zero: hundreds 1 → 0, tens 0 → 9; 10 − 2 = 8 — write 8.
  • Tens: after borrowing, 9; 9 − 1 = 8 — write 8.
  • Hundreds: after borrowing, 0 — a leading zero is not written.

100 − 12 = 88

Second check: 100 − 88 = 12

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Recalculate with different values ↑

Column subtractions of 12

ExampleDifference
75 − 1263
77 − 1265
79 − 1267
81 − 1269
83 − 1271
86 − 1274
88 − 1276
90 − 1278
95 − 1283
97 − 1285
100 − 1288
101 − 1289
104 − 1292
106 − 1294
110 − 1298
117 − 12105
148 − 12136
184 − 12172
200 − 12188
215 − 12203

FAQ

What is 100 − 12?

100 − 12 = 88

How do you check that 100 − 12 = 88?

Add the difference and the subtrahend: 88 + 12 = 100. Getting the minuend back means the difference is right.

How many times do you borrow in 100 − 12?

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

Why does 0 become 9 when borrowing in 100 − 12?

The zero has nothing to lend, so it first borrows 1 from its left neighbour and becomes 10; then it lends 1 to the column on its right and keeps 9.

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