Soluzione - Long subtraction

8, 7

8,7

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Spiegazione passo passo

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

Place value	tens	ones	.	tenths

	1	2
		0	,	6
-		2	,	7
			,

Put zeros in the blank number places:

Place value	tens	ones	.	tenths

	1	2	,	0
		0	,	6
-		2	,	7
			,

2. Subtract the numbers using long subtraction method

Because the upper digit (0) in the tenths column is too small to get a positive difference, borrow 2 from the digit (2) in the next number place which becomes (0) and get (20).

Place value	tens	ones	.	tenths
		0		20
	1	2	,	0
		0	,	6
-		2	,	7
			,

Subtract the numbers in the tenths column from the top number:
20-0-6-7=7

Place value	tens	ones	.	tenths
		0		20
	1	2	,	0
		0	,	6
-		2	,	7
			,	7

Because the upper digit (0) in the ones 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 (10).

Place value	tens	ones	.	tenths
	0	10
		0		20
	1	2	,	0
		0	,	6
-		2	,	7
			,	7

Subtract the numbers in the ones column from the top number:
10-0-2=8

Place value	tens	ones	.	tenths
	0	10
		0		20
	1	2	,	0
		0	,	6
-		2	,	7
		8	,	7

Write 0 in the tens place.

Place value	tens	ones	.	tenths
	0	10
		0		20
	1	2	,	0
		0	,	6
-		2	,	7
	0	8	,	7

The solution is: 8,7

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