Addition with Regrouping: 77 + 23

Addition with Regrouping Calculator

What is 77 + 23?

Answer

77 + 23 =

100

The sum is longer than the addends: 2 carries — into the tens and the hundreds; the last one makes a new digit

77 + 23 in a column. Carries are the small circled digits above the columns.
		1carry	1carry
			7	7
	+		2	3
		1	0	0

Column by column: 77 + 23

Ones: 7 + 3 = 10 — write 0, carry 1.
Tens: 7 + 2 + 1 = 10 — write 0, carry 1.
Hundreds: the carried 1 — write 1.

77 + 23 = 100

Second check: 100 − 77 = 23

Similar examples to practise

Related Calculations

100 − 23 = 77 - 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 23

Example	Sum
52 + 23	75
54 + 23	77
58 + 23	81
63 + 23	86
65 + 23	88
67 + 23	90
69 + 23	92
71 + 23	94
74 + 23	97
76 + 23	99
77 + 23	100
78 + 23	101
83 + 23	106
85 + 23	108
89 + 23	112
92 + 23	115
94 + 23	117
98 + 23	121
105 + 23	128
136 + 23	159

FAQ

What is 77 + 23?

77 + 23 = 100

How do you check that 77 + 23 = 100?

Subtract one addend from the sum: 100 − 23 = 77, and 100 − 77 = 23. Getting the other addend back means the sum is right.

How many carries are there in 77 + 23?

2 carries: 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 23 + 77 the same as 77 + 23?

Yes. Addition is commutative, so both give 100; the column looks the same with either number on top.

See Also