Grade 1 Mental Math: Doubles Plus One
Use doubles to solve near-doubles problems
What You'll Learn
- Recognize near-doubles problems
- Use doubles facts to solve doubles plus one
- Add consecutive numbers quickly
📖What is Doubles Plus One?
When two numbers are one apart (like 6 and 7), you can use doubles! Think of the smaller double and add 1.
✏️Example: 6 + 7
Think: 6 + 6 = 12, then add 1 more. 12 + 1 = 13!
💡Tip
You can also think of it as the bigger double minus 1: 7 + 7 = 14, so 6 + 7 = 13.
Worked examples
Real problems from the practice worksheets, solved one step at a time.
Example 1
6 + 5 = ?
- 6 needs 4 more to make 10.
- Split 5 into 4 and 1.
- 6 + 4 = 10.
- 10 + 1 = 11.
Answer: 11
Example 2
7 + 6 = ?
- 7 needs 3 more to make 10.
- Split 6 into 3 and 3.
- 7 + 3 = 10.
- 10 + 3 = 13.
Answer: 13
Example 3
4 + 5 = ?
- Start at 4 on the number line.
- Count forward 5 steps.
- You land on 9.
Answer: 9
Practice Worksheets
Doubles Plus One A
Learn doubles plus one like 3 + 4
8 problemsStart
Doubles Plus One B
More doubles plus one practice
8 problemsStart
Doubles Plus One C
Additional doubles plus one practice
8 problemsStart
Doubles Plus One D
Keep practicing doubles plus one
8 problemsStart
Doubles Plus One E
Master doubles plus one
8 problemsStart