Addition with Regrouping: 28 + 15

Addition with Regrouping Calculator

What is 28 + 15?

Answer

28 + 15 =

43

With regrouping: 1 carry — into the tens

28 + 15 in a column. Carries are the small circled digits above the columns.
		1carry
		2	8
	+	1	5
		4	3

Column by column: 28 + 15

Ones: 8 + 5 = 13 — write 3, carry 1.
Tens: 2 + 1 + 1 = 4 — write 4.

28 + 15 = 43

Second check: 43 − 28 = 15

Similar examples to practise

Related Calculations

43 − 15 = 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 15

Example	Sum
15 + 15	30
17 + 15	32
19 + 15	34
23 + 15	38
26 + 15	41
28 + 15	43
34 + 15	49
36 + 15	51
39 + 15	54
41 + 15	56
45 + 15	60
47 + 15	62
52 + 15	67
54 + 15	69
58 + 15	73
63 + 15	78
65 + 15	80
67 + 15	82
69 + 15	84
71 + 15	86

FAQ

What is 28 + 15?

28 + 15 = 43

How do you check that 28 + 15 = 43?

Subtract one addend from the sum: 43 − 15 = 28, and 43 − 28 = 15. Getting the other addend back means the sum is right.

How many carries are there in 28 + 15?

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 15 + 28 the same as 28 + 15?

Yes. Addition is commutative, so both give 43; the column looks the same with either number on top.

See Also