Solution - Long subtraction

19

See steps

Step-by-step explanation

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

Place value	tens	ones

	2	8
-		9

2. Subtract the numbers using long subtraction method

Because the upper digit (8) 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 (18).

Place value	tens	ones
	1	18
	2	8
-		9

Subtract the numbers in the ones column from the top number:
18-9=9

Place value	tens	ones
	1	18
	2	8
-		9
		9

Write 1 in the tens place.

Place value	tens	ones
	1	18
	2	8
-		9
	1	9

The solution is: 19

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Terms and topics

Long substraction