Soluzione - Long subtraction

2, 124

2,124

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Spiegazione passo passo

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

Place value	ones	.	tenths	hundredths	thousandths

	3	,	7	9
-	1	,	6	6	6
		,

Put zeros in the blank number places:

Place value	ones	.	tenths	hundredths	thousandths

	3	,	7	9	0
-	1	,	6	6	6
		,

2. Subtract the numbers using long subtraction method

Because the upper digit (0) in the thousandths column is too small to get a positive difference, borrow 1 from the digit (9) in the next number place which becomes (8) and get (10).

Place value	ones	.	tenths	hundredths	thousandths
				8	10
	3	,	7	9	0
-	1	,	6	6	6
		,

Subtract the numbers in the thousandths column from the top number:
10-0-6=4

Place value	ones	.	tenths	hundredths	thousandths
				8	10
	3	,	7	9	0
-	1	,	6	6	6
		,			4

Subtract the numbers in the hundredths column from the top number:
8-6=2

Place value	ones	.	tenths	hundredths	thousandths
				8	10
	3	,	7	9	0
-	1	,	6	6	6
		,		2	4

Subtract the numbers in the tenths column from the top number:
7-6=1

Place value	ones	.	tenths	hundredths	thousandths
				8	10
	3	,	7	9	0
-	1	,	6	6	6
		,	1	2	4

Subtract the numbers in the ones column from the top number:
3-1=2

Place value	ones	.	tenths	hundredths	thousandths
				8	10
	3	,	7	9	0
-	1	,	6	6	6
	2	,	1	2	4

The solution is: 2,124

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