Math puzzle

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Across
  1. 2. What is the 24th term of the sequence 6n+3?
  2. 3. Lucy had 87cm of tinsel, Katherine bought another 2.5m, how much do they have to decorate their Xmas tree?
  3. 4. Max size of a reflex angle
  4. 8. LCM of 600 & 800
  5. 10. 8598163 x 413
Down
  1. 1. Lucy & Katherine were shopping for reindeers. They finally settled on three called Ruldoph, Dancer and Comet. Ruldolph was £405.21. Dancer and Comet were £209.18 each. How much did they spend?
  2. 2. 85/87 x 2/7, what is the numerator of the answer?
  3. 3. 6049 x 54
  4. 5. 84630/21
  5. 6. Lucy & Katherine share 336g of chocolate in the ratio 5:2, how much does Lucy get?
  6. 7. 240 + 51 x 21/(83 - 62)
  7. 9. What is the only prime number between 950 and 960