Addition with Regrouping: 85 + 15

Addition with Regrouping Calculator

What is 85 + 15?

Answer

85 + 15 =

100

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

85 + 15 in a column. Carries are the small circled digits above the columns.
		1carry	1carry
			8	5
	+		1	5
		1	0	0

Column by column: 85 + 15

Ones: 5 + 5 = 10 — write 0, carry 1.
Tens: 8 + 1 + 1 = 10 — write 0, carry 1.
Hundreds: the carried 1 — write 1.

85 + 15 = 100

Second check: 100 − 85 = 15

Similar examples to practise

Related Calculations

100 − 15 = 85 - 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
58 + 15	73
63 + 15	78
65 + 15	80
67 + 15	82
69 + 15	84
71 + 15	86
74 + 15	89
76 + 15	91
78 + 15	93
83 + 15	98
85 + 15	100
89 + 15	104
92 + 15	107
94 + 15	109
98 + 15	113
105 + 15	120
136 + 15	151
172 + 15	187
203 + 15	218
239 + 15	254

FAQ

What is 85 + 15?

85 + 15 = 100

How do you check that 85 + 15 = 100?

Subtract one addend from the sum: 100 − 15 = 85, and 100 − 85 = 15. Getting the other addend back means the sum is right.

How many carries are there in 85 + 15?

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 15 + 85 the same as 85 + 15?

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

See Also