Niamh's mathematical crossword

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Across
  1. 1. a selection of numbers with a rule to follow
  2. 4. times a number by 2
  3. 5. an educated, sensible guess to figure out what is close to your answer
  4. 7. a number that can be divided by only 1 and itself
  5. 8. the amour to make amount of money left when you ay for something
  6. 10. the middle number of a sequence, when ordered
  7. 13. equation that use letters instead of numbers
  8. 14. the average of a sequence
Down
  1. 1. a number times by itself
  2. 2. a number ending in 1, 3, 5, 7 or 9
  3. 3. numbers that multiply together to make a specific number
  4. 6. the most common number in a sequence
  5. 7. a certain amount out of 100
  6. 9. a whole number divided into eight
  7. 11. the same as 1000ml
  8. 12. the difference between the biggest and the smallest number in a sequence.