20
The largest multiple of anything is infinite.
12
There are four of them...
-- Every multiple of 12 has a remainder of 3 when divided by 9.-- The largest multiple of 12 that's less than 220 is (12 x 18) = 216.-- So there are 18 of them.
24
24
The highest common factor of 6 and 8 is always 2 - it has to be less than or equal to the smaller of the two numbers.If you mean the highest common multiple of 6 and 8 less than 100, then it is 96.All common multiples of 6 and 8 are multiples of their Lowest Common Multiple.The LCM(6, 8) = 24, thus all common multiples of 6 and 8 are multiples of 24.The largest one less than 100 is:100 ÷ 24 = 41/6⇒ highest multiple of 24 less than 100 is 4 x 24 = 96.
4 x 5 = 20
The multiples of 4 that are less than 30 are 4, 8, 12, 16, 20, 24, 28. So the greatest multiple of 4 that is less than 30 is 28.
6 12 18 24 30
24. The largest remainder is always one less than the number by which you are dividing (the divisor).
12, (any multiple of 12 less than 100), any multiple of 12 greater than 100) Example: 12, 24, and 108