Soluzione - Long subtraction

494

494

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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	6	3
-		7	6	9

2. Subtract the numbers using long subtraction method

Because the upper digit (3) in the ones column is too small to get a positive difference, borrow 1 from the digit (6) in the next number place which becomes (5) and get (13).

Place value	thousands	hundreds	tens	ones
			5	13
	1	2	6	3
-		7	6	9

Subtract the numbers in the ones column from the top number:
13-9=4

Place value	thousands	hundreds	tens	ones
			5	13
	1	2	6	3
-		7	6	9
				4

Because the upper digit (5) 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 (15).

Place value	thousands	hundreds	tens	ones
		1	15
			5	13
	1	2	6	3
-		7	6	9
				4

Subtract the numbers in the tens column from the top number:
15-6=9

Place value	thousands	hundreds	tens	ones
		1	15
			5	13
	1	2	6	3
-		7	6	9
			9	4

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	15
			5	13
	1	2	6	3
-		7	6	9
			9	4

Subtract the numbers in the hundreds column from the top number:
11-7=4

Place value	thousands	hundreds	tens	ones
	0	11
		1	15
			5	13
	1	2	6	3
-		7	6	9
		4	9	4

Write 0 in the thousands place.

Place value	thousands	hundreds	tens	ones
	0	11
		1	15
			5	13
	1	2	6	3
-		7	6	9
	0	4	9	4

The solution is: 494

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