Murderous Math

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Across
  1. 3. ______ is the first perfect number
  2. 5. _________ are a type of fractions
  3. 9. __________ is the price of making or abtaining the
  4. 10. ________ is the price that is increased for profit
  5. 13. rounding off numbers to __________ figures.
  6. 14. _________ stands for M in the formula; New=M+Old
Down
  1. 1. _________is the longest
  2. 2. __________ is used to get rid of products with close due dates
  3. 4. Fractions, decimals and whole numbers are also ___
  4. 6. ___________ is the perimeter of a circle
  5. 7. Imperfect square root is a _________
  6. 8. __________ is the amount of gain
  7. 11. a power of a number is a______
  8. 12. the cube of 4 is ___________
  9. 15. a never-ending sequence of numbers