Do the Math!

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Across
  1. 5. The number on up in a fraction
  2. 7. The additive identity
  3. 9. Any number divided by zero
  4. 10. It’s also known as the grouping property
  5. 13. Numbers that start from one and increase in ones up to infinity are…
  6. 14. Start at negative infinity to positive infinity
  7. 15. Numbers that start from zero and increase in one’s up to infinity are…
Down
  1. 1. Property in which the order of addition and multiplication takes place isn’t important
  2. 2. Another word for annum
  3. 3. Operations should be done in this order
  4. 4. Distance travelled divided by time taken
  5. 6. Used to compare quantities of the same type
  6. 8. The number on the bottom of a fraction
  7. 11. The multiplicative identity
  8. 12. Used to compare quantities with different units