Column Addition: 15 + 12

Addition with Regrouping Calculator

What is 15 + 12?

Answer

15 + 12 =

27

No regrouping: each column is added on its own

15 + 12 in a column. No carries.
		1	5
	+	1	2
		2	7

Column by column: 15 + 12

Ones: 5 + 2 = 7 — write 7.
Tens: 1 + 1 = 2 — write 2.

15 + 12 = 27

Second check: 27 − 15 = 12

Similar examples to practise

Related Calculations

27 − 12 = 15 - Column Subtraction

See Also

Subtraction with Regrouping Calculator - Column subtraction step by step, with borrowing across zeros
Long Multiplication Calculator - Column multiplication with partial products, step by step
Long Division Calculator - Step-by-step long division with detailed explanation
Adding Fractions Calculator - Add fractions, mixed numbers and whole numbers step by step

Recalculate with different values ↑

Column additions with 12

Example	Sum
12 + 12	24
15 + 12	27
17 + 12	29
19 + 12	31
23 + 12	35
26 + 12	38
28 + 12	40
34 + 12	46
36 + 12	48
39 + 12	51
41 + 12	53
45 + 12	57
47 + 12	59
52 + 12	64
54 + 12	66
58 + 12	70
63 + 12	75
65 + 12	77
67 + 12	79
69 + 12	81

FAQ

What is 15 + 12?

15 + 12 = 27

How do you check that 15 + 12 = 27?

Subtract one addend from the sum: 27 − 12 = 15, and 27 − 15 = 12. Getting the other addend back means the sum is right.

How many carries are there in 15 + 12?

None: no column adds up to 10 or more, so every digit of the sum is written straight away.

Is 12 + 15 the same as 15 + 12?

Yes. Addition is commutative, so both give 27; the column looks the same with either number on top.

See Also