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prealgebra intermediate

Problem

My co-worker Larry only likes numbers that are divisible by 4, such as 20, or 4,004. How many different ones digits are possible in numbers that Larry likes?
Solution
If a number is divisible by 4, then it is divisible by 2, which means that its last digit must be even. The numbers 20, 12, 24, 16, and 28 show that any even digit is possible, so the number of possible last digits is .
Final answer
5