Solution - Long subtraction

4.2

4.2

See steps

Step-by-step explanation

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

Place value	ones	.	tenths

	6	.	6
	0	.	6
-	1	.	8
		.

2. Subtract the numbers using long subtraction method

Because the upper digit (6) in the tenths column is too small to get a positive difference, borrow 1 from the digit (6) in the next number place which becomes (5) and get (16).

Place value	ones	.	tenths
	5		16
	6	.	6
	0	.	6
-	1	.	8
		.

Subtract the numbers in the tenths column from the top number:
16-6-8=2

Place value	ones	.	tenths
	5		16
	6	.	6
	0	.	6
-	1	.	8
		.	2

Subtract the numbers in the ones column from the top number:
5-0-1=4

Place value	ones	.	tenths
	5		16
	6	.	6
	0	.	6
-	1	.	8
	4	.	2

The solution is: 4.2

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Long substraction