Review – subtract one-digit numbers – up to 10

Key notes :

1. Understanding Subtraction

  • Definition: Subtraction means taking away a number from another number.
  • Symbol: The subtraction sign (−) indicates that we are subtracting one number from another.

2. Basic Concepts

  • Minuend: The number from which another number is subtracted (e.g., in 7 – 3, 7 is the minuend).
  • Subtrahend: The number that is being subtracted (e.g., in 7 – 3, 3 is the subtrahend).
  • Difference: The result of the subtraction (e.g., in 7 – 3 = 4, 4 is the difference).

3. Subtraction Facts (Up to 10)

  • Students should memorize basic subtraction facts, such as:
    • 1 – 1 = 0
    • 2 – 1 = 1
    • 3 – 1 = 2, 3 – 2 = 1
    • 4 – 1 = 3, 4 – 2 = 2, 4 – 3 = 1
    • 5 – 1 = 4, 5 – 2 = 3, 5 – 3 = 2, 5 – 4 = 1
    • 6 – 1 = 5, 6 – 2 = 4, 6 – 3 = 3, 6 – 4 = 2, 6 – 5 = 1
    • 7 – 1 = 6, 7 – 2 = 5, 7 – 3 = 4, 7 – 4 = 3, 7 – 5 = 2, 7 – 6 = 1
    • 8 – 1 = 7, 8 – 2 = 6, 8 – 3 = 5, 8 – 4 = 4, 8 – 5 = 3, 8 – 6 = 2, 8 – 7 = 1
    • 9 – 1 = 8, 9 – 2 = 7, 9 – 3 = 6, 9 – 4 = 5, 9 – 5 = 4, 9 – 6 = 3, 9 – 7 = 2, 9 – 8 = 1
    • 10 – 1 = 9, 10 – 2 = 8, 10 – 3 = 7, 10 – 4 = 6, 10 – 5 = 5, 10 – 6 = 4, 10 – 7 = 3, 10 – 8 = 2, 10 – 9 = 1

Learn with an example

Subtract:

2 – 1 = _____

There are 2 tractors in total. 1 of them is crossed out. What number do you get when you start with 2 and take away 1?

To find 2 minus 1, count the tractors that are not crossed out.

There is 1 tractor left. When you start with 2 and take away 1, you are left with 1.

So, 2 − 1 = 1.

Subtract:

8 – 4 = _____

There are 8 cars in total. 4 of them are crossed out. What number do you get when you start with 8 and take away 4?

To find 8 minus 4, count the cars that are not crossed out.

There are 4 cars left. When you start with 8 and take away 4, you are left with 4.

So, 8 − 4 = 4.

Subtract:

10 – 4 = _____

There are 10 cars in total. 4 of them are crossed out. What number do you get when you start with 10 and take away 4?

To find 10 minus 4, count the cars that are not crossed out.

There are 6 cars left. When you start with 10 and take away 4, you are left with 6.

So, 10 − 4 = 6.

Let’s practice!🖊️