CW by Luke & Sam

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Across
  1. 3. (1000-22)-500+400+100
  2. 5. 5^2x18x4-54
  3. 7. (1000-300)+5^2+11
  4. 9. (200x4)+500/10+4
  5. 11. (18x56)-380
  6. 12. 100^2x20+10x3+2+2
Down
  1. 1. 45x6x4-423
  2. 2. (15x7)+(12x4)-16
  3. 3. (345x2)-400-66+700
  4. 4. 54x6-87
  5. 5. (1.50x100)+11
  6. 6. 11^2x4-26
  7. 8. 696/2-44)+44
  8. 10. (-60+-50)-50
  9. 11. (3x50)+300+150