Column Addition: 23 + 15

Addition with Regrouping Calculator

What is 23 + 15?

Answer

23 + 15 =

38

No regrouping: each column is added on its own

23 + 15 in a column. No carries.
		2	3
	+	1	5
		3	8

Column by column: 23 + 15

Ones: 3 + 5 = 8 — write 8.
Tens: 2 + 1 = 3 — write 3.

23 + 15 = 38

Second check: 38 − 23 = 15

Similar examples to practise

Related Calculations

38 − 15 = 23 - 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 15

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

FAQ

What is 23 + 15?

23 + 15 = 38

How do you check that 23 + 15 = 38?

Subtract one addend from the sum: 38 − 15 = 23, and 38 − 23 = 15. Getting the other addend back means the sum is right.

How many carries are there in 23 + 15?

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

Is 15 + 23 the same as 23 + 15?

Yes. Addition is commutative, so both give 38; the column looks the same with either number on top.

See Also