Solution - Long subtraction

5

See steps

Step-by-step explanation

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

Place value	tens	ones

	1	2
-		7

2. Subtract the numbers using long subtraction method

Because the upper digit (2) in the ones column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (12).

Place value	tens	ones
	0	12
	1	2
-		7

Subtract the numbers in the ones column from the top number:
12-7=5

Place value	tens	ones
	0	12
	1	2
-		7
		5

Write 0 in the tens place.

Place value	tens	ones
	0	12
	1	2
-		7
	0	5

The solution is: 5

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Terms and topics

Long substraction