Using subtraction,a frog makes three jumps to reach 1000.The first jump is a 1 digit number,the second is a multiple of 10 and the third is a multiple of 100.Each jump has the same initial digit.What could the subtraction be?

Answer 1

x + 10x + 100x = 1000
111x = 1000
x = 9

So by your "subtraction"

after first jump : 1000-9 = 991
after 2nd jump : 991-90 = 901
after 3rd jump : 901-900 = 1

looks like he didn't quite make it.