Subtraction with Regrouping: 640 − 172

Subtraction with Regrouping Calculator

What is 640 − 172?

Answer

640 − 172 =

468

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

640 − 172 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)	0 (was 0, now 10)
	−	1	7	2
		4	6	8

Column by column: 640 − 172

Ones: 0 is less than 2 — borrow 1 ten: tens 4 → 3; 10 − 2 = 8 — write 8.
Tens: after borrowing, 3; 3 is less than 7 — borrow 1 hundred: hundreds 6 → 5; 13 − 7 = 6 — write 6.
Hundreds: after borrowing, 5; 5 − 1 = 4 — write 4.

640 − 172 = 468

Second check: 640 − 468 = 172

Similar examples to practise

Related Calculations

468 + 172 = 640 - 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 172

Example	Difference
440 − 172	268
463 − 172	291
479 − 172	307
497 − 172	325
520 − 172	348
526 − 172	354
548 − 172	376
561 − 172	389
574 − 172	402
599 − 172	427
625 − 172	453
640 − 172	468
657 − 172	485
691 − 172	519
708 − 172	536
736 − 172	564
750 − 172	578
774 − 172	602
819 − 172	647
855 − 172	683

FAQ

What is 640 − 172?

640 − 172 = 468

How do you check that 640 − 172 = 468?

Add the difference and the subtrahend: 468 + 172 = 640. Getting the minuend back means the difference is right.

How many times do you borrow in 640 − 172?

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