Soluzione - Long subtraction

Spiegazione passo passo

Perché imparare questo

Termini e argomenti

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

2. Subtract the numbers using long subtraction method

2, 9915

2,9915

Guarda i passaggi

Put zeros in the blank number places:

Place value	ones	.	tenths	hundredths	thousandths	ten thousandths

	3	,	0	0	0	0
-	0	,	0	0	8	5
		,

Because the upper digit (0) in the ten thousandths column is too small to get a positive difference, borrow 1 from the number to the left (3.000) which becomes (2.999) and get (10).

Place value	ones	.	tenths	hundredths	thousandths	ten thousandths
	2		9	9	9	10
	3	,	0	0	0	0
-	0	,	0	0	8	5
		,

Subtract the numbers in the ten thousandths column from the top number:
10-0-5=5

Place value	ones	.	tenths	hundredths	thousandths	ten thousandths
	2		9	9	9	10
	3	,	0	0	0	0
-	0	,	0	0	8	5
		,				5

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

Place value	ones	.	tenths	hundredths	thousandths	ten thousandths
	2		9	9	9	10
	3	,	0	0	0	0
-	0	,	0	0	8	5
		,			1	5

Subtract the numbers in the hundredths column from the top number:
9-0=9

Place value	ones	.	tenths	hundredths	thousandths	ten thousandths
	2		9	9	9	10
	3	,	0	0	0	0
-	0	,	0	0	8	5
		,		9	1	5

Subtract the numbers in the tenths column from the top number:
9-0=9

Place value	ones	.	tenths	hundredths	thousandths	ten thousandths
	2		9	9	9	10
	3	,	0	0	0	0
-	0	,	0	0	8	5
		,	9	9	1	5

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

Place value	ones	.	tenths	hundredths	thousandths	ten thousandths
	2		9	9	9	10
	3	,	0	0	0	0
-	0	,	0	0	8	5
	2	,	9	9	1	5

The solution is: 2,9915

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Why learn this

Place value

hundredths

thousandths

ten thousandths

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