Subtraction with Regrouping: 78 − 39

Subtraction with Regrouping Calculator

What is 78 − 39?

Answer

78 − 39 =

39

With regrouping: 1 borrow — from the tens

78 − 39 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.
		6	+10
		7(was 7, now 6)	8 (was 8, now 18)
	−	3	9
		3	9

Column by column: 78 − 39

Ones: 8 is less than 9 — borrow 1 ten: tens 7 → 6; 18 − 9 = 9 — write 9.
Tens: after borrowing, 6; 6 − 3 = 3 — write 3.

78 − 39 = 39

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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 39

Example	Difference
78 − 39	39
80 − 39	41
84 − 39	45
86 − 39	47
91 − 39	52
93 − 39	54
97 − 39	58
102 − 39	63
104 − 39	65
106 − 39	67
108 − 39	69
110 − 39	71
113 − 39	74
115 − 39	76
117 − 39	78
122 − 39	83
124 − 39	85
128 − 39	89
131 − 39	92
133 − 39	94

FAQ

What is 78 − 39?

78 − 39 = 39

How do you check that 78 − 39 = 39?

Add the difference and the subtrahend: 39 + 39 = 78. Getting the minuend back means the difference is right.

How many times do you borrow in 78 − 39?

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