Yes, 345 is a multiple of 3. One easy way to check whether a large number is a multiple of 3 is to add its digits, and see if they are divisible by 3. 3+4+5 = 12, which is divisible by 3.
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345 ÷ 5 = 69→ previous multiple is 5 x (69-1) = 5 x 68 = 340.
115
0.0087
It is simply: 345/1 as an improper fraction
3 and 9/20