Addition with Regrouping: 12,345 + 8,042

Addition with Regrouping Calculator

What is 12,345 + 8,042?

Answer

12,345 + 8,042 =

20,387

With regrouping: 1 carry — into the ten thousands

12,345 + 8,042 in a column. Carries are the small circled digits above the columns.
		1carry
		1	2	3	4	5
	+		8	0	4	2
		2	0	3	8	7

Column by column: 12,345 + 8,042

Ones: 5 + 2 = 7 — write 7.
Tens: 4 + 4 = 8 — write 8.
Hundreds: 3 + 0 = 3 — write 3.
Thousands: 2 + 8 = 10 — write 0, carry 1.
Ten thousands: 1 + 1 = 2 — write 2.

12,345 + 8,042 = 20,387

Second check: 20,387 − 12,345 = 8,042

Similar examples to practise

Related Calculations

20,387 − 8,042 = 12,345 - 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 8,042

Example	Sum
12,340 + 8,042	20,382
12,341 + 8,042	20,383
12,342 + 8,042	20,384
12,343 + 8,042	20,385
12,344 + 8,042	20,386
12,345 + 8,042	20,387
12,346 + 8,042	20,388
12,347 + 8,042	20,389
12,348 + 8,042	20,390
12,349 + 8,042	20,391
12,350 + 8,042	20,392

FAQ

What is 12,345 + 8,042?

12,345 + 8,042 = 20,387

How do you check that 12,345 + 8,042 = 20,387?

Subtract one addend from the sum: 20,387 − 8,042 = 12,345, and 20,387 − 12,345 = 8,042. Getting the other addend back means the sum is right.

How many carries are there in 12,345 + 8,042?

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 8,042 + 12,345 the same as 12,345 + 8,042?

Yes. Addition is commutative, so both give 20,387; the column looks the same with either number on top.

See Also