Subtraction with Regrouping: 645 − 256

Subtraction with Regrouping Calculator

What is 645 − 256?

Answer

645 − 256 =

389

With regrouping: 2 borrows — from the tens and the hundreds

645 − 256 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.
		5	13	+10
		6(was 6, now 5)	4(was 4, now 13)	5 (was 5, now 15)
	−	2	5	6
		3	8	9

Column by column: 645 − 256

Ones: 5 is less than 6 — borrow 1 ten: tens 4 → 3; 15 − 6 = 9 — write 9.
Tens: after borrowing, 3; 3 is less than 5 — borrow 1 hundred: hundreds 6 → 5; 13 − 5 = 8 — write 8.
Hundreds: after borrowing, 5; 5 − 2 = 3 — write 3.

645 − 256 = 389

Second check: 645 − 389 = 256

Similar examples to practise

Related Calculations

389 + 256 = 645 - Addition with Regrouping

See Also

Addition with Regrouping Calculator - Column addition step by step, with every carry
Long Division Calculator - Step-by-step long division with detailed explanation
Long Multiplication Calculator - Column multiplication with partial products, step by step
Subtracting Fractions Calculator - Subtract fractions, mixed numbers and whole numbers step by step

Recalculate with different values ↑

Column subtractions of 256

Example	Difference
512 − 256	256
524 − 256	268
547 − 256	291
563 − 256	307
581 − 256	325
600 − 256	344
604 − 256	348
610 − 256	354
632 − 256	376
645 − 256	389
658 − 256	402
683 − 256	427
709 − 256	453
724 − 256	468
741 − 256	485
775 − 256	519
792 − 256	536
820 − 256	564
834 − 256	578
858 − 256	602

FAQ

What is 645 − 256?

645 − 256 = 389

How do you check that 645 − 256 = 389?

Add the difference and the subtrahend: 389 + 256 = 645. Getting the minuend back means the difference is right.

How many times do you borrow in 645 − 256?

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

See Also