Review – ways to subtract – up to 10
key notes :
Understanding Subtraction:
- Subtraction means taking away a number from another.
- It can be thought of as finding out how many are left after some have been removed.
Subtraction Symbols:
- The symbol for subtraction is – (minus).
- Example: In the equation 8 – 3 = 5, the number 3 is taken away from 8.
Subtraction Vocabulary:
- Minuend: The number from which another number is subtracted (e.g., in 8 – 3, 8 is the minuend).
- Subtrahend: The number that is being subtracted (e.g., in 8 – 3, 3 is the subtrahend).
- Difference: The result of subtraction (e.g., in 8 – 3 = 5, 5 is the difference).
Counting Backwards:
- Subtraction can be done by counting backwards from the minuend.
- Example: To solve 7 – 2, start at 7 and count back 2 steps (6, 5), so the answer is 5.
Using Number Lines:
- A number line can help visualize subtraction.
- Start at the minuend and move left to subtract.
- Example: For 9 – 4, start at 9 and move left 4 spaces to land on 5.
Subtraction Facts Up to 10:
- Familiarize students with basic subtraction facts within 10, such as:
- 10 – 1 = 9
- 10 – 2 = 8
- 10 – 3 = 7
- 10 – 4 = 6
- 10 – 5 = 5
- Continue until 10 – 10 = 0.
Learn with an example
Select all of the ways to make 3.
- 8 − 5
- 6 − 3
- 7 − 4
- 9 − 7
These are ways to make 3:
8 − 5 = 3
6 − 3 = 3
7 − 4 = 3
This is not a way to make 3:
9 − 7 = 2
Which is not a way to make 7?
- 9 − 2
- 7 − 0
- 10 − 3
- 6 − 0
This is not a way to make 7:
6 − 0 = 6
These are ways to make 7:
9 − 2 = 7
7 − 0 = 7
10 − 3 = 7
How do you make 2?
- 9 − 7
- 4 − 4
- 8 − 5
- 6 − 3
This is a way to make 2:
9 − 7 = 2
These are not ways to make 2:
4 − 4 = 0
8 − 5 = 3
6 − 3 = 3
Let’s practice!🖊️
