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Grade 1 Math · World 4: Twenty Bridge · Level 25
Doubles and Near Doubles
Use 6 + 6 to know 6 + 7.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 25
- Doubles keep going past 10! 6 plus 6 is 12. 7 plus 7 is 14. 8 plus 8 is 16. 9 plus 9 is 18. 10 plus 10 is 20.
- A near double is almost a double. 6 plus 7 is just like 6 plus 6, with 1 more.
- 6 plus 6 is 12. One more is 13. So 6 plus 7 is 13!
- Try a string: 8 plus 8 is 16, so 8 plus 9 is 17. 9 plus 8 is 17 too!
- When the numbers are next-door neighbors, double the smaller one and add 1.
Georgia's K-12 Mathematics Standards:
- 1.NR.2.1 — Use a variety of strategies to solve addition and subtraction problems within 20.
- 1.NR.2.2 — Use pictures, drawings, and equations to develop strategies for addition and subtraction within 20 by exploring strings of related problems.