Math Puzzle

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Across
  1. 3. How do you count?
  2. 7. 17+62
  3. 8. 470+30
Down
  1. 1. 70+2
  2. 2. 6+10
  3. 3. ABC and ___
  4. 4. 39+4
  5. 5. 50+20
  6. 6. 55+35
  7. 7. 100+100
  8. 8. 17+33