Soluzione - Long subtraction

378

378

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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

	1	2	3	0
-		8	5	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 digit (3) in the next number place which becomes (2) and get (10).

Place value	thousands	hundreds	tens	ones
			2	10
	1	2	3	0
-		8	5	2

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

Place value	thousands	hundreds	tens	ones
			2	10
	1	2	3	0
-		8	5	2
				8

Because the upper digit (2) in the tens column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (12).

Place value	thousands	hundreds	tens	ones
		1	12
			2	10
	1	2	3	0
-		8	5	2
				8

Subtract the numbers in the tens column from the top number:
12-5=7

Place value	thousands	hundreds	tens	ones
		1	12
			2	10
	1	2	3	0
-		8	5	2
			7	8

Because the upper digit (1) in the hundreds column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (11).

Place value	thousands	hundreds	tens	ones
	0	11
		1	12
			2	10
	1	2	3	0
-		8	5	2
			7	8

Subtract the numbers in the hundreds column from the top number:
11-8=3

Place value	thousands	hundreds	tens	ones
	0	11
		1	12
			2	10
	1	2	3	0
-		8	5	2
		3	7	8

Write 0 in the thousands place.

Place value	thousands	hundreds	tens	ones
	0	11
		1	12
			2	10
	1	2	3	0
-		8	5	2
	0	3	7	8

The solution is: 378

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