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### Course: Arithmetic>Unit 12

Lesson 3: Subtracting decimals intro

# Subtracting decimals

We'll start with simple problems like 0.9 - 0.8 and build to more complex problems like 12.6 - 8.89.
The problems go from easy to more difficult, and along the way there are examples and explanations in case you get stuck. If you get confused, just think of it as a chance to learn!
Let's start by subtracting tenths.

## Problem set 1:

Problem 1a
$0.8-0.6=$

Beautiful! Let's move on to problems with whole numbers and tenths.

## Problem set 2:

Problem 2a
$1.5-1.2=$

Excellent! Let's move on to work with some larger numbers.

## Problem set 3:

Problem 3a
$12.3-2=$

Rockin'! Let's move on to some more difficult problems with whole numbers and tenths.

## Problem set 4:

Problem 4a
$9-4.9=$

Cool! Now let's subtract hundredths.

## Problem set 5:

Problem 5a
$0.64-0.41=$

Great! Let's move on to problems with whole numbers, tenths, and hundredths.

## Problem set 6:

Problem 6a
$0.53-0.4=$

Rockin'! Now we're ready to use bigger numbers.

## Problem set 7:

Problem 7a
$44.83-32=$

Sweet! Let's finish with some more challenging problems.

## Problem set 8:

Problem 8a
$9-6.35=$

## Want to join the conversation?

• this is confuseing
• What part is confusing?
• do we use math every day?😐
• yes, example: if you need 5 apples for a pie but you want to double the amount to make two pies... how many do you have to get? (that was just an easy example)
• This is kinda easy for me but for some people it could be confusing and hard.
• I’m glad this is easy for you.

The likely cause of confusion for some people, when subtracting decimals, is failing to line up decimal points first and/or failing to put in zeros for missing digits.
• I don't get that 1.0 - 0.59 is 0.41. How is it o.41?
• Because the 1.0 can also be expressed as 1.00
If you view it that way, as
1.00
-0.59
It will equal 0.41
The steps are,
First you subtract the 0 in the hundredth's place by the 9 in the other's hundredth's place. But 0 is less than 9, so you need to borrow from the tenth's place.
Unfortunately, how do you borrow? The value there is 0 as well, and there isn't really anything for you to borrow.
Fortunately, the one's place has a 1. This means the tenths place can borrow from that for a "10", and afterward the hundredth's place can borrow from the 10 in the tenth's place.
10 - 9 =1
9 - 5= 4
0 - 0 = 0
So you end up with 0.41
• are there negative decimals?
• Yes, there are negative decimals. Every real positive number has an opposite that is negative.
These are valid negative number: -8.32; -5 3/4; -0.05
• what would happen if math wouldn't be in are life
• I don't think math wouldn't be in our lives because we have math everywhere. We have math when we need to calculate the money you're going to pay to the cashier and stuff.
(1 vote)
• Is anyone else doing this on a computer from school for homework? I am it is Friday and it's due Monday.😨😨 Gonna be busy this weekend. Comment and up vote my post if you do i will do a shootout to all of y'all next year on January and its December.
• i am homeschooled and get on the computer every other day to do school on this website.