Subtraction with Regrouping: 90 − 12

Subtraction with Regrouping Calculator

What is 90 − 12?

Answer

90 − 12 =

78

With regrouping: 1 borrow — from the tens

90 − 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.
		8	+10
		9(was 9, now 8)	0 (was 0, now 10)
	−	1	2
		7	8

Column by column: 90 − 12

Ones: 0 is less than 2 — borrow 1 ten: tens 9 → 8; 10 − 2 = 8 — write 8.
Tens: after borrowing, 8; 8 − 1 = 7 — write 7.

90 − 12 = 78

Second check: 90 − 78 = 12

Similar examples to practise

Related Calculations

78 + 12 = 90 - 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 12

Example	Difference
64 − 12	52
66 − 12	54
70 − 12	58
75 − 12	63
77 − 12	65
79 − 12	67
81 − 12	69
83 − 12	71
86 − 12	74
88 − 12	76
90 − 12	78
95 − 12	83
97 − 12	85
100 − 12	88
101 − 12	89
104 − 12	92
106 − 12	94
110 − 12	98
117 − 12	105
148 − 12	136

FAQ

What is 90 − 12?

90 − 12 = 78

How do you check that 90 − 12 = 78?

Add the difference and the subtrahend: 78 + 12 = 90. Getting the minuend back means the difference is right.

How many times do you borrow in 90 − 12?

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

See Also