maths

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Across
  1. 3. (16)2+ 20
  2. 4. 100x2 + 40x1+ 8
  3. 6. 1000-139
  4. 8. CCXXVII
  5. 10. 800-17
Down
  1. 1. 1kg 128 grams in grams
  2. 2. 92x4
  3. 5. 804/2
  4. 7. 50 dozens
  5. 9. (20)2+ ((18)2+ (3)2