Addition with Regrouping: 89 + 28

Addition with Regrouping Calculator

What is 89 + 28?

Answer

89 + 28 =

117

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

89 + 28 in a column. Carries are the small circled digits above the columns.
		1carry	1carry
			8	9
	+		2	8
		1	1	7

Column by column: 89 + 28

Ones: 9 + 8 = 17 — write 7, carry 1.
Tens: 8 + 2 + 1 = 11 — write 1, carry 1.
Hundreds: the carried 1 — write 1.

89 + 28 = 117

Second check: 117 − 89 = 28

Similar examples to practise

Related Calculations

117 − 28 = 89 - 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 28

Example	Sum
65 + 28	93
67 + 28	95
69 + 28	97
71 + 28	99
72 + 28	100
74 + 28	102
76 + 28	104
78 + 28	106
83 + 28	111
85 + 28	113
89 + 28	117
92 + 28	120
94 + 28	122
98 + 28	126
105 + 28	133
136 + 28	164
172 + 28	200
203 + 28	231
239 + 28	267
268 + 28	296

FAQ

What is 89 + 28?

89 + 28 = 117

How do you check that 89 + 28 = 117?

Subtract one addend from the sum: 117 − 28 = 89, and 117 − 89 = 28. Getting the other addend back means the sum is right.

How many carries are there in 89 + 28?

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 28 + 89 the same as 89 + 28?

Yes. Addition is commutative, so both give 117; the column looks the same with either number on top.

See Also