Subtraction with Regrouping: 90 − 45

Subtraction with Regrouping Calculator

What is 90 − 45?

Answer

90 − 45 =

45

With regrouping: 1 borrow — from the tens

90 − 45 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)
	−	4	5
		4	5

Column by column: 90 − 45

Ones: 0 is less than 5 — borrow 1 ten: tens 9 → 8; 10 − 5 = 5 — write 5.
Tens: after borrowing, 8; 8 − 4 = 4 — write 4.

90 − 45 = 45

Similar examples to practise

Related Calculations

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 45

Example	Difference
90 − 45	45
92 − 45	47
97 − 45	52
99 − 45	54
103 − 45	58
108 − 45	63
110 − 45	65
112 − 45	67
114 − 45	69
116 − 45	71
119 − 45	74
121 − 45	76
123 − 45	78
128 − 45	83
130 − 45	85
134 − 45	89
137 − 45	92
139 − 45	94
143 − 45	98
150 − 45	105

FAQ

What is 90 − 45?

90 − 45 = 45

How do you check that 90 − 45 = 45?

Add the difference and the subtrahend: 45 + 45 = 90. Getting the minuend back means the difference is right.

How many times do you borrow in 90 − 45?

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