Math

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123456
Across
  1. 2. 390-10+2-70=
  2. 3. 2000-1200+100-1000=
  3. 4. 200-_-70+10=100 fill in the blank
  4. 6. 30x100/3
Down
  1. 1. 100+23-51=
  2. 2. 4001-1000+2-3=
  3. 3. 20-12+9-7-3(5)
  4. 4. 3(20+50)+100-10+2(50)=
  5. 5. 1000-2(100)+10-20(40)=
  6. 6. 30-3-8=