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Grade 1 Math · World 4: Twenty Bridge · Level 29
True or False to 20
The equal sign and missing numbers within 20.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 29
- Remember: the equal sign means the same as. Both sides must be the same amount.
- Is 9 plus 6 equal to 10 plus 5? The left side is 15. The right side is 15. True!
- Is 13 equal to 20 minus 6? 20 minus 6 is 14, not 13. False!
- Missing numbers can hide anywhere. 15 equals 8 plus what? 8 and 7 make 15, so the missing number is 7.
- Work out each side, and make them match.
Georgia's K-12 Mathematics Standards:
- 1.NR.2.5 — Use the meaning of the equal sign to determine whether equations involving addition and subtraction are true or false.
- 1.NR.2.6 — Determine the unknown whole number in an addition or subtraction equation relating to three whole numbers.