The phrase "how many 9 at 100" isn't entirely clear, but if you're asking how many times the digit 9 appears in the number 100, the answer is zero, as there are no nines in 100. If you meant something else, please provide more context for a more accurate answer.
100 / 9 = 11 remainder 1
100
The answer is 9 times 9 x 100 = 900
11.
100 of them.
9x9+9+9+9/9
100,0000000 (9 zeroes)
9
20 of them
9
100 has 9 factors: 1, 2, 4, 5, 10, 20, 25, 50 and 100.
There are 5 20s in a 100.