Soluzione - Long subtraction

48, 47

48,47

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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	hundredths

	5	7	,	2
-		8	,	7	3
			,

Put zeros in the blank number places:

Place value	tens	ones	.	tenths	hundredths

	5	7	,	2	0
-		8	,	7	3
			,

2. Subtract the numbers using long subtraction method

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

Place value	tens	ones	.	tenths	hundredths
				1	10
	5	7	,	2	0
-		8	,	7	3
			,

Subtract the numbers in the hundredths column from the top number:
10-0-3=7

Place value	tens	ones	.	tenths	hundredths
				1	10
	5	7	,	2	0
-		8	,	7	3
			,		7

Because the upper digit (1) in the tenths column is too small to get a positive difference, borrow 1 from the digit (7) in the next number place which becomes (6) and get (11).

Place value	tens	ones	.	tenths	hundredths
		6		11
				1	10
	5	7	,	2	0
-		8	,	7	3
			,		7

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

Place value	tens	ones	.	tenths	hundredths
		6		11
				1	10
	5	7	,	2	0
-		8	,	7	3
			,	4	7

Because the upper digit (6) in the ones column is too small to get a positive difference, borrow 1 from the digit (5) in the next number place which becomes (4) and get (16).

Place value	tens	ones	.	tenths	hundredths
	4	16
		6		11
				1	10
	5	7	,	2	0
-		8	,	7	3
			,	4	7

Subtract the numbers in the ones column from the top number:
16-8=8

Place value	tens	ones	.	tenths	hundredths
	4	16
		6		11
				1	10
	5	7	,	2	0
-		8	,	7	3
		8	,	4	7

Write 4 in the tens place.

Place value	tens	ones	.	tenths	hundredths
	4	16
		6		11
				1	10
	5	7	,	2	0
-		8	,	7	3
	4	8	,	4	7

The solution is: 48,47

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