Addition with Regrouping: 28 + 23

Addition with Regrouping Calculator

What is 28 + 23?

Answer

28 + 23 =

51

With regrouping: 1 carry — into the tens

28 + 23 in a column. Carries are the small circled digits above the columns.
		1carry
		2	8
	+	2	3
		5	1

Column by column: 28 + 23

Ones: 8 + 3 = 11 — write 1, carry 1.
Tens: 2 + 2 + 1 = 5 — write 5.

28 + 23 = 51

Second check: 51 − 28 = 23

Similar examples to practise

Related Calculations

51 − 23 = 28 - 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
23 + 23	46
26 + 23	49
28 + 23	51
34 + 23	57
36 + 23	59
39 + 23	62
41 + 23	64
45 + 23	68
47 + 23	70
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

FAQ

What is 28 + 23?

28 + 23 = 51

How do you check that 28 + 23 = 51?

Subtract one addend from the sum: 51 − 23 = 28, and 51 − 28 = 23. Getting the other addend back means the sum is right.

How many carries are there in 28 + 23?

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 23 + 28 the same as 28 + 23?

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

See Also