Column Addition: 402 + 23

Addition with Regrouping Calculator

What is 402 + 23?

Answer

402 + 23 =

425

No regrouping: each column is added on its own

402 + 23 in a column. No carries.
		4	0	2
	+		2	3
		4	2	5

Column by column: 402 + 23

Ones: 2 + 3 = 5 — write 5.
Tens: 0 + 2 = 2 — write 2.
Hundreds: nothing to add — write 4.

402 + 23 = 425

Second check: 425 − 402 = 23

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Related Calculations

425 − 23 = 402 - 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 23

Example	Sum
136 + 23	159
172 + 23	195
177 + 23	200
203 + 23	226
239 + 23	262
268 + 23	291
277 + 23	300
307 + 23	330
348 + 23	371
376 + 23	399
402 + 23	425
453 + 23	476
485 + 23	508
536 + 23	559
578 + 23	601
647 + 23	670
677 + 23	700
777 + 23	800
877 + 23	900
977 + 23	1,000

FAQ

What is 402 + 23?

402 + 23 = 425

How do you check that 402 + 23 = 425?

Subtract one addend from the sum: 425 − 23 = 402, and 425 − 402 = 23. Getting the other addend back means the sum is right.

How many carries are there in 402 + 23?

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

Is 23 + 402 the same as 402 + 23?

Yes. Addition is commutative, so both give 425; the column looks the same with either number on top.

See Also