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40+10+0 -40 + 10 + 0

Full solution

Q. 40+10+0 -40 + 10 + 0
  1. Add 1010 to 40-40: Add 1010 to 40-40, which is like moving 1010 steps forward from 40-40 on the number line.\newline40+10=30-40 + 10 = -30
  2. Add 00 to 30-30: Now add 00 to 30-30, but adding 00 doesn't change the value.\newline30+0=30-30 + 0 = -30