Subtraction with Regrouping: 400 − 144

Subtraction with Regrouping Calculator
Minuend
Subtrahend

What is 400 − 144?

Answer

400 − 144 =
256

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

400 − 144 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.
39+10
4(was 4, now 3)0(was 0, now 9)0 (was 0, now 10)
−144
256

Column by column: 400 − 144

  • Ones: 0 is less than 4 — borrow 1 hundred across the zero: hundreds 4 → 3, tens 0 → 9; 10 − 4 = 6 — write 6.
  • Tens: after borrowing, 9; 9 − 4 = 5 — write 5.
  • Hundreds: after borrowing, 3; 3 − 1 = 2 — write 2.

400 − 144 = 256

Second check: 400 − 256 = 144

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Column subtractions from 400

ExampleDifference
400 − 12388
400 − 19381
400 − 28372
400 − 39361
400 − 47353
400 − 52348
400 − 58342
400 − 67333
400 − 74326
400 − 83317
400 − 92308
400 − 93307
400 − 105295
400 − 144256
400 − 149251
400 − 197203

FAQ

What is 400 − 144?

400 − 144 = 256

How do you check that 400 − 144 = 256?

Add the difference and the subtrahend: 256 + 144 = 400. Getting the minuend back means the difference is right.

How many times do you borrow in 400 − 144?

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 400 − 144?

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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