Subtraction with Regrouping: 172 − 78

Subtraction with Regrouping Calculator

What is 172 − 78?

Answer

172 − 78 =

94

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

172 − 78 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	16	+10
		1(was 1, now 0)	7(was 7, now 16)	2 (was 2, now 12)
	−		7	8
			9	4

Column by column: 172 − 78

Ones: 2 is less than 8 — borrow 1 ten: tens 7 → 6; 12 − 8 = 4 — write 4.
Tens: after borrowing, 6; 6 is less than 7 — borrow 1 hundred: hundreds 1 → 0; 16 − 7 = 9 — write 9.
Hundreds: after borrowing, 0 — a leading zero is not written.

172 − 78 = 94

Second check: 172 − 94 = 78

Similar examples to practise

Related Calculations

94 + 78 = 172 - 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 78

Example	Difference
156 − 78	78
161 − 78	83
163 − 78	85
167 − 78	89
170 − 78	92
172 − 78	94
176 − 78	98
183 − 78	105
214 − 78	136
250 − 78	172
281 − 78	203
317 − 78	239
346 − 78	268
385 − 78	307
426 − 78	348
454 − 78	376
480 − 78	402
531 − 78	453
563 − 78	485
614 − 78	536

FAQ

What is 172 − 78?

172 − 78 = 94

How do you check that 172 − 78 = 94?

Add the difference and the subtrahend: 94 + 78 = 172. Getting the minuend back means the difference is right.

How many times do you borrow in 172 − 78?

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