Addition with Regrouping: 172 + 78

Addition with Regrouping Calculator

What is 172 + 78?

Answer

172 + 78 =

250

With regrouping: 2 carries — into the tens and the hundreds

172 + 78 in a column. Carries are the small circled digits above the columns.
		1carry	1carry
		1	7	2
	+		7	8
		2	5	0

Column by column: 172 + 78

Ones: 2 + 8 = 10 — write 0, carry 1.
Tens: 7 + 7 + 1 = 15 — write 5, carry 1.
Hundreds: 1 + 1 = 2 — write 2.

172 + 78 = 250

Second check: 250 − 172 = 78

Similar examples to practise

Related Calculations

250 − 78 = 172 - 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 78

Example	Sum
78 + 78	156
83 + 78	161
85 + 78	163
89 + 78	167
92 + 78	170
94 + 78	172
98 + 78	176
105 + 78	183
136 + 78	214
172 + 78	250
203 + 78	281
239 + 78	317
268 + 78	346
307 + 78	385
348 + 78	426
376 + 78	454
402 + 78	480
453 + 78	531
485 + 78	563
536 + 78	614

FAQ

What is 172 + 78?

172 + 78 = 250

How do you check that 172 + 78 = 250?

Subtract one addend from the sum: 250 − 78 = 172, and 250 − 172 = 78. Getting the other addend back means the sum is right.

How many carries are there in 172 + 78?

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 78 + 172 the same as 172 + 78?

Yes. Addition is commutative, so both give 250; the column looks the same with either number on top.

See Also