Solution - Long subtraction

3, 612

3,612

See steps

Step-by-step explanation

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

Place value	thousands	hundreds	tens	ones

	3	6	2	1
-				9

2. Subtract the numbers using long subtraction method

Because the upper digit (1) 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 (11).

Place value	thousands	hundreds	tens	ones
			1	11
	3	6	2	1
-				9

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

Place value	thousands	hundreds	tens	ones
			1	11
	3	6	2	1
-				9
				2

Write 1 in the tens place.

Place value	thousands	hundreds	tens	ones
			1	11
	3	6	2	1
-				9
			1	2

Write 6 in the hundreds place.

Place value	thousands	hundreds	tens	ones
			1	11
	3	6	2	1
-				9
		6	1	2

Write 3 in the thousands place.

Place value	thousands	hundreds	tens	ones
			1	11
	3	6	2	1
-				9
	3	6	1	2

The solution is: 3,612

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Long substraction