Soluzione - Long subtraction

2.988

2.988

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Spiegazione passo passo

1. Rewrite the numbers from top to bottom, aligned by their place values

Place value	thousands	hundreds	tens	ones

	3	0	0	0
-			1	2

2. Subtract the numbers using long subtraction method

Because the upper digit (0) in the ones column is too small to get a positive difference, borrow 1 from the number to the left (300) which becomes (299) and get (10).

Place value	thousands	hundreds	tens	ones
	2	9	9	10
	3	0	0	0
-			1	2

Subtract the numbers in the ones column from the top number:
10-2=8

Place value	thousands	hundreds	tens	ones
	2	9	9	10
	3	0	0	0
-			1	2
				8

Subtract the numbers in the tens column from the top number:
9-1=8

Place value	thousands	hundreds	tens	ones
	2	9	9	10
	3	0	0	0
-			1	2
			8	8

Write 9 in the hundreds place.

Place value	thousands	hundreds	tens	ones
	2	9	9	10
	3	0	0	0
-			1	2
		9	8	8

Write 2 in the thousands place.

Place value	thousands	hundreds	tens	ones
	2	9	9	10
	3	0	0	0
-			1	2
	2	9	8	8

The solution is: 2,988

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