Addition with Regrouping: 39 + 12

Addition with Regrouping Calculator

What is 39 + 12?

Answer

39 + 12 =

51

With regrouping: 1 carry — into the tens

39 + 12 in a column. Carries are the small circled digits above the columns.
		1carry
		3	9
	+	1	2
		5	1

Column by column: 39 + 12

Ones: 9 + 2 = 11 — write 1, carry 1.
Tens: 3 + 1 + 1 = 5 — write 5.

39 + 12 = 51

Second check: 51 − 39 = 12

Similar examples to practise

Related Calculations

51 − 12 = 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 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 39 + 12?

39 + 12 = 51

How do you check that 39 + 12 = 51?

Subtract one addend from the sum: 51 − 12 = 39, and 51 − 39 = 12. Getting the other addend back means the sum is right.

How many carries are there in 39 + 12?

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 12 + 39 the same as 39 + 12?

Yes. Addition is commutative, so both give 51; the column looks the same with either number on top.

See Also