Grade 1
  1. Numbers and Counting  1.1. Counting to 10  1.2. Counting to 20  1.3. Counting to 50  1.4. Counting to 100  1.5. Writing Numbers 1 to 10  1.6. Writing Numbers 1 to 20  1.7. Writing Numbers 1 to 50  1.8. Writing Numbers 1 to 100  1.9. Reading Numbers 1 to 10  1.10. Reading Numbers 1 to 20  1.11. Reading Numbers 1 to 50  1.12. Reading Numbers 1 to 100  1.13. Comparing Numbers  1.14. Ordering Numbers  1.15. Odd and Even Numbers  1.16. Number Patterns  1.17. Skip Counting by 2s, 5s, and 10s  1.18. Understanding Zero
  2. Basic Addition and Subtraction  2.1. Understanding Addition  2.2. Addition Facts within 10  2.3. Addition Facts within 20  2.4. Adding Zero  2.5. Adding One More  2.6. Adding Two More  2.7. Adding Three More  2.8. Adding Using Pictures  2.9. Addition Word Problems  2.10. Understanding Subtraction  2.11. Subtraction Facts within 10  2.12. Subtraction Facts within 20  2.13. Subtracting Zero  2.14. Subtracting One  2.15. Subtracting Two  2.16. Subtraction Using Pictures  2.17. Subtraction Word Problems  2.18. Introduction to Doubles Facts  2.19. Introduction to Making 10
  3. Place Value and Number Sense  3.1. Understanding Tens and Ones  3.2. Counting by Tens  3.3. Place Value within 20  3.4. Place Value within 50  3.5. Place Value within 100  3.6. Reading and Writing Two-Digit Numbers  3.7. Comparing Two-Digit Numbers  3.8. Decomposing Numbers
  4. Measurement  4.1. Length  4.1.1. Comparing Lengths  4.1.2. Measuring with Non-Standard Units  4.1.3. Using Standard Units (Inches and Centimeters) in Length  4.2. Weight  4.2.1. Comparing Weights  4.2.2. Heavy and Light Objects  4.2.3. Introduction to Grams and Pounds  4.3. Capacity  4.3.1. Comparing Capacity  4.3.2. Full and Empty  4.3.3. Introduction to Liters and Milliliters  4.4. Time  4.4.1. Telling Time to the Hour  4.4.2. Telling Time to the Half Hour  4.4.3. Days of the Week  4.4.4. Months of the Year  4.4.5. Understanding Yesterday, Today, and Tomorrow  4.5. Money  4.5.1. Recognizing Coins  4.5.2. Counting Coins  4.5.3. Introduction to Dollar and Cents Symbols  4.5.4. Simple Addition and Subtraction with Money
  5. Geometry  5.1. 2D Shapes  5.1.1. Recognizing 2D Shapes  5.1.2. Drawing 2D Shapes  5.1.3. Naming 2D Shapes  5.1.4. Properties of 2D Shapes  5.1.5. Sorting 2D Shapes  5.1.6. Composing Simple Shapes  5.2. 3D Shapes  5.2.1. Recognizing 3D Shapes  5.2.2. Naming 3D Shapes  5.2.3. Properties of 3D Shapes  5.2.4. Sorting 3D Shapes  5.3. Position and Direction  5.3.1. Left and Right  5.3.2. Above and Below  5.3.3. Inside and Outside  5.3.4. Near and Far  5.3.5. In Front and Behind
  6. Patterns and Sorting  6.1. Recognizing Patterns  6.2. Extending Patterns  6.3. Creating Patterns  6.4. Sorting by Color  6.5. Sorting by Shape  6.6. Sorting by Size
  7. Data and Graphing  7.1. Introduction to Data  7.2. Collecting Data  7.3. Tally Marks  7.4. Bar Graphs  7.5. Picture Graphs  7.6. Interpreting Simple Graphs
  8. Fractions  8.1. Understanding Halves  8.2. Understanding Fourths  8.3. Dividing Shapes into Equal Parts  8.4. Identifying Equal and Unequal Parts

Grade 1 → Basic Addition and Subtraction ↓


Subtracting One


Subtracting one is one of the simplest operations you can learn. It is a basic part of math, especially for young children studying in Grade 1. All you have to do is subtract one from a number.

Understanding "Subtract One"

To understand subtraction, you first need to know what subtraction is. Subtraction is when you subtract something from a group or number. When we talk about subtraction, it means that we are subtracting one from a number.

Why subtract one?

Subtracting one helps us find the number just before a given number. This is helpful in counting backwards or finding the number that comes just before another number.

Visual example

Let us look at some examples for better understanding:

5 circles

Imagine you have 5 circles. If you remove one circle, how many circles are left?

4 circles

Now, after removing one, there are 4 circles left.

Example using numbers

We can also use numbers to understand subtraction:

5 - 1 = 4

This means that if you start with 5 and subtract 1, you are left with 4.

Practice makes perfect

Here are some more examples for practice:

  • 8 - 1 = 7
  • 3 - 1 = 2
  • 6 - 1 = 5
  • 10 - 1 = 9

Try subtracting one from different numbers and see how it works.

Practicing subtraction using money

Another way to understand subtraction is to use coins. Imagine you have 5 coins:

5 coins

If you spend 1 coin, you now have:

4 coins

This gives you a real life example of subtraction.

Fun activities to lose weight

Learning is more fun with activities. Try these:

Activity 1: Use candy or toys to practice. Start with 7 candies/toys, give one to your friend, and see how many are left.

Activity 2: Make 10 stars. Colour one star a different colour. How many stars are not coloured?

Counting backwards

Subtracting one is like counting backwards. If you can count one step backward, you are subtracting one.

For example, if you start at 9 and count one number backwards, you get this:

9, 8

It is like this:

9 - 1 = 8

Subtract one using fingers

You can also use your fingers to help you make a reduction.

Raise 7 fingers up. Now put one finger down. How many fingers are still up?

this shows that:

7 - 1 = 6

Conclusion

Subtraction is a simple but very useful skill. It is the basis for more complex mathematical operations.

Practicing subtraction will help you get better at math and counting. Keep using different exercises and fun activities to make the learning process fun.

Happy learning!


Grade 1 → 2.14


U
username
0%
completed in Grade 1

← Prev (2.13)
Subtracting Zero
Next (2.15) →
Subtracting Two

Comments 



Subtracting One

https://www.buddymath.com/g1/2.14?bmal=en