Addition with Regrouping: 39 + 15

Addition with Regrouping Calculator

What is 39 + 15?

Answer

39 + 15 =

54

With regrouping: 1 carry — into the tens

39 + 15 in a column. Carries are the small circled digits above the columns.
		1carry
		3	9
	+	1	5
		5	4

Column by column: 39 + 15

Ones: 9 + 5 = 14 — write 4, carry 1.
Tens: 3 + 1 + 1 = 5 — write 5.

39 + 15 = 54

Second check: 54 − 39 = 15

Similar examples to practise

Related Calculations

54 − 15 = 39 - Subtraction with Regrouping

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 39 + 15?

39 + 15 = 54

How do you check that 39 + 15 = 54?

Subtract one addend from the sum: 54 − 15 = 39, and 54 − 39 = 15. Getting the other addend back means the sum is right.

How many carries are there in 39 + 15?

1 carry: every time a column added up to 10 or more, its ones digit was written and 1 was carried to the next column on the left.

Is 15 + 39 the same as 39 + 15?

Yes. Addition is commutative, so both give 54; the column looks the same with either number on top.

See Also