Muhammad's puzzle

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Across
  1. 3. shared between
  2. 5. something that represents a quantity when counting
  3. 7. taking numbers
  4. 9. adding numbers
Down
  1. 1. Something used for making mathematical calculations
  2. 2. a number that can only be divided by one or itself
  3. 3. the amount of numbers between two numbers
  4. 4. the answer of two numbers that are added together
  5. 6. groups of
  6. 8. plus numbers together