Solution - Long subtraction

8.2

8.2

See steps

Step-by-step explanation

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

Place value	tens	ones	.	tenths

	2	0	.	1
-	1	1	.	9
			.

2. Subtract the numbers using long subtraction method

Because the upper digit (1) in the tenths column is too small to get a positive difference, borrow 1 from the number to the left (20) which becomes (19) and get (11).

Place value	tens	ones	.	tenths
		1		11
	2	0	.	1
-	1	1	.	9
			.

Subtract the numbers in the tenths column from the top number:
11-9=2

Place value	tens	ones	.	tenths
		1		11
	2	0	.	1
-	1	1	.	9
			.	2

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

Place value	tens	ones	.	tenths
		1		11
	2	0	.	1
-	1	1	.	9
		8	.	2

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

Place value	tens	ones	.	tenths
		1		11
	2	0	.	1
-	1	1	.	9
	0	8	.	2

The solution is: 8.2

How did we do?

Please leave us feedback.

Why learn this

Terms and topics

Long substraction