Math Olympiad for 3rd Grade – 2

The total number of 2-digit positive integers with the ten-digit greater than the unit-digit is __________.
The sum of 20 consecutive natural numbers is 2010. The smallest one is __________ and the largest one is __________.
The following are rows of equations: $$4+2=6$$ $$5+8=13$$ $$6+14=20$$ $$7+20=27$$$$……$$ The equation of the 99th row is __________.
To cut a pizza into 11 pieces, the minimum number of straight cut required with a knife is __________.
You are required to subtract 285 from 3000, add 282 to it; then subtract 285 and add 282 again; repeat the process until the number become 0. The number of subtractions performed is __________.