Soluzione - Long subtraction

7, 77

7,77

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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

	2	4
-	1	6	,	2	3
			,

Put zeros in the blank number places:

Place value	tens	ones	.	tenths	hundredths

	2	4	,	0	0
-	1	6	,	2	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 number to the left (4.0) which becomes (3.9) and get (10).

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

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

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

Subtract the numbers in the tenths column from the top number:
9-2=7

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

Because the upper digit (3) in the ones 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 (13).

Place value	tens	ones	.	tenths	hundredths
	1	13
		3		9	10
	2	4	,	0	0
-	1	6	,	2	3
			,	7	7

Subtract the numbers in the ones column from the top number:
13-6=7

Place value	tens	ones	.	tenths	hundredths
	1	13
		3		9	10
	2	4	,	0	0
-	1	6	,	2	3
		7	,	7	7

Subtract the numbers in the tens column from the top number:
1-1=0

Place value	tens	ones	.	tenths	hundredths
	1	13
		3		9	10
	2	4	,	0	0
-	1	6	,	2	3
	0	7	,	7	7

The solution is: 7,77

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