10, 25, 45, 54, 60, 75, 80
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10
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45
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54
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75
Reveal answer
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C
Correct answer
Explanation
In 10, 25, 45, 54, 60, 75, 80, all numbers are multiples of 5 except 54, which is not divisible by 5 (54 ÷ 5 = 10.8). Every other number ends in 0 or 5, the hallmark of multiples of 5.
AI explanation
Every number except 54 is a multiple of 5 (10, 25, 45, 60, 75, 80), so 54 is the odd one out since it isn't divisible by 5. Recognizing the common multiple shared by most terms reveals the outlier.