6th-7th Grade math puzzle

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Across
  1. 3. The leftover of a long division
  2. 8. Math that involves unknown letters
  3. 9. The difference of 2 parts
  4. 10. The sum of 2 parts
Down
  1. 1. A letter that holds an unknown number
  2. 2. The quotient of 2 parts
  3. 4. The product of 2 parts
  4. 5. A number that isn't a whole number
  5. 6. 2 numbers that involve the numerator, and the denominator
  6. 7. Fractions where the denominator is 100