(i) Multiples are the numbers which we get after multiplying a number with an integer.
Here,
11×1=11
11×2=22
11×3=33
11×4=44
11×5=55
11×6=66
11×7=77
So, 77 is the seventh multiple of 11.
(ii) Again,
11×1=11
11×2=22
11×3=33
11×4=44
11×5=55
11×6=66
11×7=77
11×8=88
11×9=99
11×10=110
Here 110 > 100, So only there are 9 multiples of 11, which are less than 100.