Solve the Decimal Subtraction: 1 - 0.2 Step by Step

Q: Why do I need to write 1 as 1.0?

Writing 1 as 1.0 helps you see the place values clearly! It shows you have 1 in the ones place and 0 in the tenths place, making subtraction much easier to visualize.

Q: How can I check if my decimal subtraction is correct?

Use addition to check! Add your answer to the number you subtracted: $ 0.8 + 0.2 $. If you get the original number (1), your answer is right!

Q: What's the easiest way to remember decimal subtraction?

Remember "Point Down, Line Up!" Always line up the decimal points vertically, and your decimal point in the answer goes straight down from the others.

Decimal Subtraction with Borrowing

$1-0.2=$

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations

00:00 Solve

00:04 We will use long subtraction for calculation

00:08 We'll place 0 and the decimal point in the appropriate place

00:14 We'll borrow from the larger digit to subtract

00:17 The larger digit will decrease by 1, and our digit will increase by 10

00:29 Now we'll subtract from the larger number and place

00:41 We'll continue to subtract and place accordingly

00:48 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution

Understand the problem

$1-0.2=$

Step-by-step solution

To solve this problem, we'll perform the following steps:

Align the numbers by their decimal points:

$1.0$
$- 0.2$
$----$

Perform the subtraction, starting from the rightmost digit (the tenths place since decimals are aligned):

$0.0$ in the tenths place subtract $0.2$ results in $0.8$ .

In the ones place, there is no further subtraction, simply keeping the placed zero.

Overall, the subtraction $1 - 0.2$ results in $0.8$ .

Therefore, the solution to the problem is $0.8$ .

Final Answer

0.8

Key Points to Remember

Essential concepts to master this topic

Alignment: Line up decimal points vertically before subtracting
Technique: Rewrite 1 as 1.0 to match decimal places
Check: Add result back: $0.8 + 0.2 = 1.0$ ✓

Common Mistakes

Avoid these frequent errors

Not aligning decimal points properly
Don't subtract 1 - 0.2 by placing numbers randomly = wrong calculation! This leads to incorrect place value subtraction and wrong answers like 0.98. Always align decimal points vertically and add zeros to match decimal places.

Practice Quiz

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FAQ

Everything you need to know about this question

Why do I need to write 1 as 1.0?

Writing 1 as 1.0 helps you see the place values clearly! It shows you have 1 in the ones place and 0 in the tenths place, making subtraction much easier to visualize.

What if I get confused about borrowing with decimals?

Think of it like regular subtraction! When you can't subtract in the tenths place, you borrow from the ones place. $1.0$ becomes $0.10$ , then $10 - 2 = 8$ tenths.

How can I check if my decimal subtraction is correct?

Use addition to check! Add your answer to the number you subtracted: $0.8 + 0.2$ . If you get the original number (1), your answer is right!

Is there a pattern for subtracting decimals from whole numbers?

Yes! When subtracting a decimal from a whole number, your answer will always be less than the whole number but have the same decimal places as what you're subtracting.

What's the easiest way to remember decimal subtraction?

Remember "Point Down, Line Up!" Always line up the decimal points vertically, and your decimal point in the answer goes straight down from the others.

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