Column Addition: 172 + 15

Addition with Regrouping Calculator

What is 172 + 15?

Answer

172 + 15 =

187

No regrouping: each column is added on its own

172 + 15 in a column. No carries.
		1	7	2
	+		1	5
		1	8	7

Column by column: 172 + 15

Ones: 2 + 5 = 7 — write 7.
Tens: 7 + 1 = 8 — write 8.
Hundreds: nothing to add — write 1.

172 + 15 = 187

Second check: 187 − 172 = 15

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Related Calculations

187 − 15 = 172 - Column Subtraction

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
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
453 + 15	468
485 + 15	500

FAQ

What is 172 + 15?

172 + 15 = 187

How do you check that 172 + 15 = 187?

Subtract one addend from the sum: 187 − 15 = 172, and 187 − 172 = 15. Getting the other addend back means the sum is right.

How many carries are there in 172 + 15?

None: no column adds up to 10 or more, so every digit of the sum is written straight away.

Is 15 + 172 the same as 172 + 15?

Yes. Addition is commutative, so both give 187; the column looks the same with either number on top.

See Also