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 ↓


Addition Facts within 20


Addition is a fundamental operation in math. In Grade 1, children begin to explore basic addition facts. These facts give them the tools they need to solve simple math problems quickly and confidently. In this guide, we will focus on "Addition Facts within 20."

Understanding addition

Addition means putting things together. When we add, we combine two or more numbers to find the total or sum. For example, if you have 2 apples and someone gives you 3 more apples, you will have a total of 2 + 3 = 5 apples.

The numbers we add are called addition. The answer we get is called the sum.

Adding numbers up to 20

Addition facts within 20 are combinations of numbers that, when added together, give a sum from 0 to 20. Mastering these facts helps students quickly solve more complex problems as they progress in their math education.

Here are some examples of adding facts within 20:

  • 0 + 5 = 5
  • 1 + 9 = 10
  • 4 + 6 = 10
  • 8 + 7 = 15
  • 9 + 9 = 18

Using tools to learn addition

Using objects, fingers or pictures can help children understand addition. Let's see how we can use pictures to visualise addition.

Example: Visualizing addition using circles

Let's add 3 + 4.

Draw three circles, then four more, and count all the circles together.

Counting all these circles, the total is 3 + 4 = 7.

Strategies for addition within 20

Various strategies can be helpful for mastering addition facts within 20. Let's take a look at some of them:

Counting on

Start with the larger number and count down to the smaller number. For example, for 6 + 3, start with 6 and count down the next three numbers: 7, 8, 9. So, 6 + 3 = 9.

Using the number line

A number line is a straight line with numbers placed at equal intervals. We can use a number line to add numbers. Here's how:

Consider 5 + 4:

0 1 2 3 4 5 6 7 8 9 10 11 12

Start at 5 and jump 4 times to the right. You'll land on 9, so 5 + 4 = 9.

Make ten

When the numbers are close to ten, this strategy involves making ten and then adding the rest. Let's use 8 + 5 as an example:

  • Think about how much you need to add to 8 to make it 10. We need to add 2 more because 8 + 2 = 10.
  • If 2 is subtracted from 5, the remainder is 3.
  • Add the remainder 3 to 10, so 10 + 3 = 13.
  • Thus, 8 + 5 = 13.

Double facts

Double factors are sums that add two identical numbers together, such as 2 + 2 or 5 + 5 These are easy to remember:

  • 0 + 0 = 0
  • 1 + 1 = 2
  • 2 + 2 = 4
  • 3 + 3 = 6
  • 4 + 4 = 8
  • 5 + 5 = 10
  • 6 + 6 = 12
  • 7 + 7 = 14
  • 8 + 8 = 16
  • 9 + 9 = 18

Practicing addition facts

Practicing regularly is the key to mastering addition facts. Here are some practice exercises you can try:

Simple addition questions

  • What is 7 + 3?
  • Find the sum of 9 + 4.
  • What is 6 + 6?
  • Calculate 8 + 5.
  • Add 10 + 10.

Fill in the blanks

  • 5 + ___ = 8
  • ___ + 9 = 17
  • 4 + ___ = 12
  • 7 + ___ = 20

Conclusion

Mastering addition facts within 20 is an important step for grade 1 students to gain confidence in math. By understanding, practicing, and using different strategies, children can quickly learn these facts and use them as a basis for more complex math. Making math fun and engaging with games and activities can greatly help in this learning process. By practicing different strategies such as counting, using the number line, making tens, and remembering doubles, children can increase their speed and accuracy with addition facts within 20.


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Addition Facts within 20

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