Addition with Regrouping: 105 + 15

Addition with Regrouping Calculator

What is 105 + 15?

Answer

105 + 15 =

120

With regrouping: 1 carry — into the tens

105 + 15 in a column. Carries are the small circled digits above the columns.
			1carry
		1	0	5
	+		1	5
		1	2	0

Column by column: 105 + 15

Ones: 5 + 5 = 10 — write 0, carry 1.
Tens: 0 + 1 + 1 = 2 — write 2.
Hundreds: nothing to add — write 1.

105 + 15 = 120

Second check: 120 − 105 = 15

Similar examples to practise

Related Calculations

120 − 15 = 105 - 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
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
268 + 15	283
307 + 15	322
348 + 15	363
376 + 15	391
402 + 15	417

FAQ

What is 105 + 15?

105 + 15 = 120

How do you check that 105 + 15 = 120?

Subtract one addend from the sum: 120 − 15 = 105, and 120 − 105 = 15. Getting the other addend back means the sum is right.

How many carries are there in 105 + 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 + 105 the same as 105 + 15?

Yes. Addition is commutative, so both give 120; the column looks the same with either number on top.

See Also