Addition with Regrouping: 78 + 12

Addition with Regrouping Calculator

What is 78 + 12?

Answer

78 + 12 =

90

With regrouping: 1 carry — into the tens

78 + 12 in a column. Carries are the small circled digits above the columns.
		1carry
		7	8
	+	1	2
		9	0

Column by column: 78 + 12

Ones: 8 + 2 = 10 — write 0, carry 1.
Tens: 7 + 1 + 1 = 9 — write 9.

78 + 12 = 90

Second check: 90 − 78 = 12

Similar examples to practise

Related Calculations

90 − 12 = 78 - 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
52 + 12	64
54 + 12	66
58 + 12	70
63 + 12	75
65 + 12	77
67 + 12	79
69 + 12	81
71 + 12	83
74 + 12	86
76 + 12	88
78 + 12	90
83 + 12	95
85 + 12	97
88 + 12	100
89 + 12	101
92 + 12	104
94 + 12	106
98 + 12	110
105 + 12	117
136 + 12	148

FAQ

What is 78 + 12?

78 + 12 = 90

How do you check that 78 + 12 = 90?

Subtract one addend from the sum: 90 − 12 = 78, and 90 − 78 = 12. Getting the other addend back means the sum is right.

How many carries are there in 78 + 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 + 78 the same as 78 + 12?

Yes. Addition is commutative, so both give 90; the column looks the same with either number on top.

See Also