Grade 1 Mental Math: Doubles Facts
Learn doubles facts for quick mental math
What You'll Learn
- Memorize doubles facts to 10
- Recognize doubles problems quickly
- Use doubles as anchor facts
📖What are Doubles?
Doubles are when you add a number to itself: 1+1, 2+2, 3+3, and so on. These facts are easy to memorize!
✏️Doubles Facts
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
💡Tip
The answer to a double is always an even number!
Worked examples
Real problems from the practice worksheets, solved one step at a time.
Example 1
5 + 5 = ?
- Start at 5 on the number line.
- Count forward 5 steps.
- You land on 10.
Answer: 10
Example 2
9 + 9 = ?
- 9 needs 1 more to make 10.
- Split 9 into 1 and 8.
- 9 + 1 = 10.
- 10 + 8 = 18.
Answer: 18
Example 3
1 + 1 = ?
- Start at 1 on the number line.
- Count forward 1 step.
- You land on 2.
Answer: 2