345 ÷ 5 = 69
→ previous multiple is 5 x (69-1) = 5 x 68 = 340.
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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.
5
5 comes before 6.
1*345, 3*115, 5*69, and 15*23 all equal 345.
4.