if all the digits add up to a number divisible by 3 like 195
195= 1+9+5= 15...15/3=5 so it is divisible by 3
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Do the division, and see if there is a remainder.
If the last three digits can be divided evenly by 8, then so can the entire number
No other number except 1 divides evenly into both 4 and 5, so 4/5 is in simplest form
In the decimal numbering system, if the number ends in 0 or 5 it is evenly divisible by 5. If it ends in any other number it is not.
A whole number is evenly divisible by 10 only if its last digit is a zero.