Deck crossword

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123456
Across
  1. 1. the greatest a number can be
  2. 5. when more than 2 numbers are grouped together
  3. 6. adding 2 numbers together
Down
  1. 2. taking away from 2 numbers
  2. 3. set of whole numbers and their opposites
  3. 4. A number can be written as "a" and "b"
  4. 5. a numbers opposite