Welcome to Clip from Spiral logo

Interactive video lesson plan for: Subtracting decimals-Mistake Proof Method

Activity overview:

Step by step directions for subtracting decimals.
I use graph paper to help organize the numbers and avoid mistakes.
The key to subtracting decimals is to always have the decimals lines up.
Welcome to moomoomath where we upload a new Math video everyday.
In this video I would like to talk about subtracting decimals.
I call this the no mistake method.
Many times when we subtract decimals it can be confusing figuring out where the decimal should be and what numbers you should subtract.
What you can do is use graph paper at least at first until you get a hang of this and it helps you keep all of your rows organized.
Lets get started.
I will make this column the decimals and I will write 2.5 and when you subtract you keep the decimals lined up and i will write .076 here.
Now what I will do is for each block I will write in a zero.
This helps you visualize what you are subtracting.
I next start subtracting and I can't subtract from zero so I will borrow 10 and I have another zero so I can't borrow there so I will move to the 5 and it will become a 4 and this will become a 10 and I will borrow and this number becomes a 10 and the number to the left becomes a nine.
10-6 = 4
and bring down your 2 so you end up with 2.424
This next example of subtracting decimals requires some rewriting.
We have .564 minus 2.632
I will write 2.632 first because it is larger and just subtract but keep the sign of the larger number.
12-4 = 8
We need to borrow.
12-6 =6
5-5 = 0
Write the decimal point and bring down the 2
and it becomes - 2. 068
Let's finish with one more.
This last one and it is different because you have 3 numbers to subtract.
I will write three decimals.
I will write the 3 then -1.02 and then the .654
I will write zeros everywhere else.
I now start subtracting
Again I need to borrow 10 and I will borrow the 10 from the 3.
This becomes 10 and the next zero will become a 9 and we have,
10-4 =6
Bring down the decimal
and 2-1=1
We end up with 1.326
Recap I use the graph paper because it help me line up the columns and prevent mistakes.
MooMooMath uploads a new math video eveyday.
Thanks for watching.

Please watch: "Study Skills Teacher's Secret Guide to your Best Grades"

Tagged under: decimals,subtracting decimals,numbers,math,moomoomath,subtracting decimals mistake proof method,maths,subtraction,addition

Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.

Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip

Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans

Play this activity

1. Students enter a simple code

2. You play the video

3. The students comment

4. You review and reflect

* Whiteboard required for teacher-paced activities

Share on:

Share Subtracting decimals-Mistake Proof Method on Google+ Share Subtracting decimals-Mistake Proof Method on Twitter Share Subtracting decimals-Mistake Proof Method on Facebook Pin Subtracting decimals-Mistake Proof Method Email Subtracting decimals-Mistake Proof Method

Ready to see what else Spiral logo can do?

With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.


Carry out a quickfire formative assessment to see what the whole class is thinking


Create interactive presentations to spark creativity in class

Team Up

Student teams can create and share collaborative presentations from linked devices


Turn any public video into a live chat with questions and quizzes

1000s of teachers use Spiral to deliver awesome, engaging activities that capture students' understanding during lessons.

Now it's your turn Sign up

Spiral Reviews by Teachers and Digital Learning Coaches

Review of Spiral by teacher: Kathryn Laster @kklaster

Tried out the canvas response option on @SpiralEducation & it's so awesome! Add text or drawings AND annotate an image! #R10tech

Review of Spiral by teacher: Room 220 Math Stars @3rdgradeBCE

Using @SpiralEducation in class for math review. Student approved! Thumbs up! Thanks.

Review of Spiral by teacher: Miss Ord @ordmiss

Absolutely amazing collaboration from year 10 today. 100% engagement and constant smiles from all #lovetsla #spiral

Review of Spiral by teacher: Adam J. Stryker @strykerstennis

Students show better Interpersonal Writing skills than Speaking via @SpiralEducation Great #data #langchat folks!

Review of Spiral by teacher: Dr Ayla Göl @iladylayla

A good tool for supporting active #learning.

Review of Spiral by teacher: Brett Erenberg @BrettErenberg

The Team Up app is unlike anything I have ever seen. You left NOTHING out! So impressed!

Get the Clip Chrome Extension & Create Video Lessons in Seconds

Add Clip to Chrome