Math Crossword

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Across
  1. 3. -80-1x3/3+2
  2. 4. -(6x10,000)+(1x1,000)+(3x100)+(3x10)+(8x1)
  3. 6. -Value of 2 in 12,381
  4. 7. -20,000,000+1,000,000+800,000+40,000+5,000+300+20+6
  5. 8. -4x1+5+5-0
Down
  1. 1. -Value of 3 in 2,432,198
  2. 2. -50,000,000+8,000,000+800,000+20,000+9,000+300+30+1
  3. 5. -100+10+1