Addition with Regrouping: 45 + 39

Addition with Regrouping Calculator

What is 45 + 39?

Answer

45 + 39 =

84

With regrouping: 1 carry — into the tens

45 + 39 in a column. Carries are the small circled digits above the columns.
		1carry
		4	5
	+	3	9
		8	4

Column by column: 45 + 39

Ones: 5 + 9 = 14 — write 4, carry 1.
Tens: 4 + 3 + 1 = 8 — write 8.

45 + 39 = 84

Second check: 84 − 45 = 39

Similar examples to practise

Related Calculations

84 − 39 = 45 - 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 39

Example	Sum
39 + 39	78
41 + 39	80
45 + 39	84
47 + 39	86
52 + 39	91
54 + 39	93
58 + 39	97
63 + 39	102
65 + 39	104
67 + 39	106
69 + 39	108
71 + 39	110
74 + 39	113
76 + 39	115
78 + 39	117
83 + 39	122
85 + 39	124
89 + 39	128
92 + 39	131
94 + 39	133

FAQ

What is 45 + 39?

45 + 39 = 84

How do you check that 45 + 39 = 84?

Subtract one addend from the sum: 84 − 39 = 45, and 84 − 45 = 39. Getting the other addend back means the sum is right.

How many carries are there in 45 + 39?

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 39 + 45 the same as 45 + 39?

Yes. Addition is commutative, so both give 84; the column looks the same with either number on top.

See Also