Grade 2 Operations & Algebraic Thinking Vocabulary

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Across
  1. 1. problem A math problem written using words and real-life situations.
  2. 4. math Solving math problems in your head without writing them down.
  3. 6. To find the answer to a problem.
  4. 9. A number that is added to another number in an addition problem.
  5. 11. Addition facts where the same number is added twice.
Example: 4 + 4 = 8
  6. 14. To take one number away from another number.
  7. 16. groups Groups that each have the same number of objects.
  8. 17. sentence A math sentence using numbers and symbols to show an operation or comparison.
  9. 19. addend An unknown number in an addition problem.
Example: 5 + ___ = 9
  10. 21. around facts Addition facts that use the same numbers in a different order but have the same sum.
Example: 2 + 6 = 8 and 6 + 2 = 8
  11. 22. Horizontal lines of objects in an array.
  12. 24. The answer to a subtraction problem.
  13. 29. The math operation used to combine numbers to find a total or sum.
  14. 30. family A group of related addition and subtraction facts that use the same numbers.
Example: 3 + 4 = 7 and 7 − 4 = 3
  15. 31. A set of objects put together.
  16. 34. equation A math sentence that is correct.
Example: 4 + 2 = 6
  17. 35. addition Adding the same number again and again.
Example: 3 + 3 + 3
  18. 36. Having the same amount or value.
  19. 37. A math action such as addition or subtraction.
  20. 39. number A number that cannot be divided into two equal groups evenly.
Down
  1. 2. plus one An addition strategy using a doubles fact and adding one more.
Example: 4 + 5 = 4 + 4 + 1
  2. 3. A plan or method used to solve a math problem.
  3. 5. property A rule that says changing the order of numbers does not change the answer in addition.
Example: 3 + 5 = 5 + 3
  4. 7. Vertical lines of objects in an array.
  5. 8. A sequence that repeats or follows a rule.
  6. 10. The math operation used to find how much is left or the difference.
  7. 12. number A number that can be divided into two equal groups with nothing left over.
  8. 13. than A value that is smaller than another value.
Example: 2 < 5
  9. 15. A missing number or value that needs to be found in a math problem.
  10. 18. The answer to an addition problem.
  11. 20. than A value that is larger than another value.
Example: 9 > 4
  12. 23. count Counting forward by the same number each time.
Example: 2, 4, 6, 8
  13. 25. equation A math sentence that is not correct.
Example: 5 + 2 = 10
  14. 26. A math sentence that uses an equals sign to show two amounts are the same.
Example: 5 + 3 = 8
  15. 27. To decide if one number is greater than, less than, or equal to another number.
  16. 28. ten A strategy where numbers are combined to make 10 first to help solve a problem more easily.
  17. 32. value The value of a digit based on its position in a number.
Example: In 45, the 4 means 40.
  18. 33. Objects arranged in equal rows and columns to help show repeated addition or multiplication.
  19. 38. To put two or more numbers together to find a total.