Subtraction with Regrouping: 30 − 15

Subtraction with Regrouping Calculator

What is 30 − 15?

Answer

30 − 15 =

15

With regrouping: 1 borrow — from the tens

30 − 15 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.
		2	+10
		3(was 3, now 2)	0 (was 0, now 10)
	−	1	5
		1	5

Column by column: 30 − 15

Ones: 0 is less than 5 — borrow 1 ten: tens 3 → 2; 10 − 5 = 5 — write 5.
Tens: after borrowing, 2; 2 − 1 = 1 — write 1.

30 − 15 = 15

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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 15

Example	Difference
30 − 15	15
32 − 15	17
34 − 15	19
38 − 15	23
41 − 15	26
43 − 15	28
49 − 15	34
51 − 15	36
54 − 15	39
56 − 15	41
60 − 15	45
62 − 15	47
67 − 15	52
69 − 15	54
73 − 15	58
78 − 15	63
80 − 15	65
82 − 15	67
84 − 15	69
86 − 15	71

FAQ

What is 30 − 15?

30 − 15 = 15

How do you check that 30 − 15 = 15?

Add the difference and the subtrahend: 15 + 15 = 30. Getting the minuend back means the difference is right.

How many times do you borrow in 30 − 15?

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