Unit 1: Whole Numbers: Place Value, Comparison, Addition, and Subtraction

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Across
  1. 2. the way a number is written with numerals.
  2. 5. to make something clear and easier to understand.
  3. 7. to prove something is right or correct by giving good reasons for it.
  4. 9. the place where something or someone is in relation to other things or people.
  5. 10. sign a symbol that means "is the same value as."
  6. 11. to compose or decompose ones, tens, hundreds, thousands, and so forth.
  7. 14. something that makes sense when given facts are taken into account.
  8. 17. to use as a sign or symbol for something.
  9. 18. a group of three places in a number, usually separated by commas. The first three periods are the ones period, the thousands period, and the millions period.
  10. 20. a symbol used to write numbers: 0, 1, 2, 3, 4, 5, 6, 7,8, and 9.
  11. 21. to approximate the value of a number by finding the nearest ten, hundred, or other place value.
  12. 22. to look at two things closely to see what is similar and what is different about them.
  13. 23. the result of addition.
Down
  1. 1. the result of subtraction.
  2. 3. a set of routine steps used to solve problems.
  3. 4. (<) a symbol used to compare two numbers when the first is less than the second.
  4. 6. the way a number is written with words or said aloud.
  5. 8. (>) a symbol used to compare two numbers when the first is greater than the second.
  6. 10. a way a number is written to show the place value of each digit. For example, 249 = 200 + 40 + 9.
  7. 12. the value assigned to a digit based on its position in a number. For example, the 2 in 324 is in the tens place and has a value of 2 tens or 20.
  8. 13. a number being added.
  9. 15. (verb) to give an approximate number or answer based on mathematical thinking.
  10. 16. (noun) a close guess made using mathematical thinking.
  11. 19. the result of subtraction.