Subtraction

We created these videos to help our late primary students practice a number line approach to subtraction. You’ll notice that the first 3 videos in the series do not mention the word subtraction. Don’t worry. We’re slowly building the foundation and will be bringing more abstract reasoning as we go.

Video 1: Chewy and BB8 find the difference

Video 2: Chewy and BB8 explore what is missing

Video 3: Chewy and BB8 use empty number lines to find the difference

Video 4: Chewy and BB8 explore what is left over

This video on subtraction stacking methods was developed for parents to help them make sense of the different options, but is helpful for teachers too.

Number Line Strategy 2: Counting Back

numeracylabcoq Activities January 21, 2021February 12, 2021Practice, Primary, Subtraction 0 Comment

Level 1 Practice Pages (to 100): Does it make sense to count up or count back?

Set 1 (pdf): How many are missing up to 20
Set 1 (Word Document):How many are missing up to 20
Set 2 (pdf): How many are missing up to 40
Set 2 (Word Document): How many are missing up to 40
Set 3 (pdf): What is the Difference up to 100
Set 3 (Word Document): How many are missing up to 100

Level 2 Practice Pages (to 1000): Does it make sense to count up or count back?

Set 1 (pdf): How many are missing up to 200
Set 1 (Word Document): How many are missing up to 200
Set 2 (pdf) : How many are missing up to 400
Set 2 (Word Document): How many are missing up to 400
Set 3 (pdf): How many are missing up to 1000
Set 3 (Word Document): How many are missing up to 1000

English Subtraction Resources

numeracylabcoq Activities January 5, 2021March 19, 2021Intermediate, Practice, Primary, Subtraction 0 Comment

Number Line Strategy 1: Counting up to find the difference

Number Line Strategy 2: Counting back to find how many are left

Open-Number Line Practice: Less scaffolding for students who are proficient with using open number lines for practice.

Stacking Strategies: What kinds of stacking strategies are available? There are three common ones for you to choose from. We have one video that shows each of the three strategies so you see how they match up! There are advantages and disadvantages to each approach. What ever you choose will take lots of practice.