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	tens	ones	.	tenths

	1	0	.	5
		2	.	1
-		4	.	2
			.

2. Subtract the numbers using long subtraction method

Subtract the numbers in the tenths column from the top number:
5-1-2=2

Place value	tens	ones	.	tenths

	1	0	.	5
		2	.	1
-		4	.	2
			.	2

Because the upper digit (0) 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 (10).

Place value	tens	ones	.	tenths
	0	10
	1	0	.	5
		2	.	1
-		4	.	2
			.	2

Subtract the numbers in the ones column from the top number:
10-2-4=4

Place value	tens	ones	.	tenths
	0	10
	1	0	.	5
		2	.	1
-		4	.	2
		4	.	2

Write 0 in the tens place.

Place value	tens	ones	.	tenths
	0	10
	1	0	.	5
		2	.	1
-		4	.	2
	0	4	.	2

The solution is: 4.2

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Long substraction