Lucky to Learn Math - 1st Grade - Lesson 2.14 - Adding Doubles ... - Free Printable

Problem Description:

The task involves solving each "doubles fact" (addition problems where both numbers being added are the same) and determining whether the given equation is TRUE or FALSE. If the equation is TRUE, it should be colored green; if FALSE, it should be colored blue.

Solution Approach:

1. Identify Each Doubles Fact: Each equation in the image represents a doubles fact.
2. Solve Each Equation: Calculate the sum of the two identical numbers.
3. Compare with the Given Result: Check if the calculated sum matches the result provided in the equation.
4. Determine Truthfulness:
- If the calculated sum matches the given result, the equation is TRUE.
- If the calculated sum does not match the given result, the equation is FALSE.
5. Color Accordingly: Color the leaf green for TRUE equations and blue for FALSE equations.

Step-by-Step Analysis of Each Equation:

#### Top Row:
1. 2 + 2 = 4
- Calculation: \(2 + 2 = 4\)
- Result: TRUE
- Color: Green

2. 7 + 7 = 15
- Calculation: \(7 + 7 = 14\)
- Result: FALSE
- Color: Blue

3. 5 + 5 = 10
- Calculation: \(5 + 5 = 10\)
- Result: TRUE
- Color: Green

#### Second Row:
4. 3 + 3 = 6
- Calculation: \(3 + 3 = 6\)
- Result: TRUE
- Color: Green

5. 1 + 1 = 3
- Calculation: \(1 + 1 = 2\)
- Result: FALSE
- Color: Blue

6. 3 + 3 = 5
- Calculation: \(3 + 3 = 6\)
- Result: FALSE
- Color: Blue

#### Third Row:
7. 5 + 5 = 11
- Calculation: \(5 + 5 = 10\)
- Result: FALSE
- Color: Blue

8. 8 + 8 = 16
- Calculation: \(8 + 8 = 16\)
- Result: TRUE
- Color: Green

9. 10 + 10 = 2
- Calculation: \(10 + 10 = 20\)
- Result: FALSE
- Color: Blue

#### Fourth Row:
10. 10 + 10 = 20
- Calculation: \(10 + 10 = 20\)
- Result: TRUE
- Color: Green

11. 2 + 2 = 3
- Calculation: \(2 + 2 = 4\)
- Result: FALSE
- Color: Blue

12. 7 + 7 = 15
- Calculation: \(7 + 7 = 14\)
- Result: FALSE
- Color: Blue

#### Fifth Row:
13. 4 + 4 = 8
- Calculation: \(4 + 4 = 8\)
- Result: TRUE
- Color: Green

14. q + q = 18
- This equation uses a variable \(q\). Without a specific value for \(q\), we cannot determine its truthfulness. However, since the task focuses on doubles facts with numerical values, this equation is outside the scope of the task. For the purpose of this exercise, we can assume it is irrelevant or marked as FALSE.
- Result: FALSE (assumed)
- Color: Blue

Final Coloring Guide:

- Green (TRUE): 2 + 2 = 4, 5 + 5 = 10, 3 + 3 = 6, 8 + 8 = 16, 10 + 10 = 20, 4 + 4 = 8
- Blue (FALSE): 7 + 7 = 15, 1 + 1 = 3, 3 + 3 = 5, 5 + 5 = 11, 10 + 10 = 2, 2 + 2 = 3, 7 + 7 = 15, q + q = 18

Final Answer:

\[
\boxed{
\text{Green: } 2+2=4, 5+5=10, 3+3=6, 8+8=16, 10+10=20, 4+4=8 \\
\text{Blue: } 7+7=15, 1+1=3, 3+3=5, 5+5=11, 10+10=2, 2+2=3, 7+7=15, q+q=18
}
\]