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 ↓


Introduction to Doubles Facts


What are doubles facts?

Doubles facts are simple addition problems where the same number is added to itself. By learning doubles facts, children can do their calculations faster and with more confidence. For example, adding 2 + 2 or 5 + 5 are doubles facts. Doubles facts are fundamental tools that help children master higher-level math tasks as they advance in their education. They also provide a foundation for better understanding addition and subtraction.

Facts related to the importance of doubles

Understanding doubles facts can greatly improve a child's math fluency. Children often find these facts easy to remember, and they serve as useful references when solving other math problems. For example, knowing that 6 + 6 = 12 can help a child quickly understand that 6 + 7 is just one more than 12, which is 13.

Basic doubles facts

Here's a list of basic doubles facts 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
  • 10 + 10 = 20

Visualization of doubles facts

Let's take a closer look at these doubles facts:

0 + 0 = 0 1 + 1 = 2 2 + 2 = 4

Using doubles facts: An example

Now let's see how we can use double facts to solve the sum problem:

Let's say you need to solve 7 + 8. If you know that 7 + 7 = 14, you just need to add one more to get 15, since 8 is one more than 7.

7 + 7 = 14
14 + 1 = 15
So, 7 + 8 = 15

How to teach doubles facts to kids

When teaching doubles facts, use objects that children can touch and move around. This concrete visual is very effective for young learners. You can also use blocks, counters, or fingers.

Practical learning with counters

Give children some counting tools and ask them to physically form groups and count doubles.

Example:

  • Give the child 6 counters.
  • Ask them to divide the counters into two equal groups of three each.
  • Count the first group: 1, 2, 3.
  • Count the second group: 1, 2, 3.
  • By grouping, they see 3 + 3 = 6.

Using the number line

The number line can help understand the addition process with double factors:

Start with zero. To add 6 + 6:

  1. Start at 0 on the number line.
  2. Put "Jump" on 6.
  3. Make another "jump" of 6 spaces to land on 12.

Thus, 6 + 6 = 12.

0 6 12

Doubling in subtraction

Doubles facts can also be useful for subtraction. When children know their doubles facts, they can see patterns like these:

If 8 - 4 is presented, children learn to recognize that since 4 + 4 = 8, then 8 - 4 must be one of the numbers used in the double, which is 4.

If 4 + 4 = 8, then:
8 - 4 = 4

Using visualization for subtraction

Help children visualize subtraction problems by using doubles on the number line:

For 10 - 5:

  1. Start at 10 on the number line.
  2. Count back 5 places to get to 5.

Since 5 + 5 = 10, then 10 - 5 = 5.

0 5 10

Games and activities to practice doubles

Learning double facts can be fun using games and playful activities. Here are some suggestions:

Memory match game

Make cards with double facts on one side and their solutions on the other. Players take turns flipping over two cards, and try to match the problems to their answers.

Doubles fact bingo

Create bingo cards with the solutions to the doubles facts. Call out the doubles fact problem, and have kids mark the correct answer on their bingo cards.

Chant doubles

Encourage children to chant double facts in rhythm. For example: "Two and two make four, let's do a little more! Three and three? Six, voila!"

Conclusion

Introducing doubles facts establishes a strong foundation for addition and subtraction skills. By practicing doubles facts, students become more fluent in their calculations and are better equipped to handle more complex math problems as they progress in their education. Creating an engaging and interactive learning environment using physical objects, games, and visual aids can make these concepts more understandable and enjoyable for young learners.


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Introduction to Doubles Facts

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