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Intro to Subtraction
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What you will learn from this videoWhat you will learn
- We’ll learn that subtraction is taking away from a group of things.
- We'll also learn how to solve subtraction problems with numbers up to 10!
- And we'll explore how this knowledge can help us have a party, take care of animals, and even eat donuts!
This video was just released 07/19/2021.
Lesson materials will follow about 1 week later.
- Discussion Questions
Before Video
How can you use counters to show adding?ANSWERI can show the first number with counters, and then show the second number with counters. To find how many in all I can count all the counters.
2 + 5 = 7 . There are 7 ducks in all.
I can start at 4. Then I count on 5 numbers. 5, 6, 7, 8, 9. I counted 5 more numbers. The last number I said was 9. 4 and 5 are 9.
I can count on my fingers. 1, 2, 3, 4, 5. 1 + 4 = 5.
The + means I am adding 3 and 2. The = means 3 plus 2 is equal to 5.
After Video
What does subtraction mean?ANSWERSubtraction means to take away. When I subtract 3 from 5, I take away 3 from 5.
ANSWERI can use counters to show how many there are to start. Then I can take away counters to show how many I subtract. Then I can count the amount that is left. Or I can count back from the start number as I take away the number of counters to subtract.
The – means that 4 is taken away from 6. The 2 means that there are 2 left over. 6 take away 4 is 2.
4 – 1 = 3. There are 3 balls left.
I always take away the smaller (lesser) number. The words in the problem tell me what number is there to start and what is taken away.
- Vocabulary
- Add DEFINE
To put together. If you add 3 and 2, you find how many there are in all.
- Subtraction DEFINE
To take away. If you take away 2 from 3, you find how many are left after 2 are taken away from 3.
- Count on DEFINE
To count in increasing counting order. 1, 2, 3, 4, 5, 6, …
- Count back DEFINE
To count in decreasing counting order. 9, 8, 7, 6, 5, …
- Greater DEFINE
A number is greater than another number if you count it second when counting.
- Lesser DEFINE
A number is less than another number if you count it first when counting.
- Add DEFINE
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide
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Level 1
There are 4 ducks on the pond. 3 ducks fly away. How many ducks are left in the pond?
Level 2
There are 7 kids playing tag. 2 kids leave. How many kids are still playing?
Level 3
There are 10 puppies on the grass. 6 puppies leave. How many puppies are left on the grass?
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