Digital ACT Math Practice Question #1285
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
Formula: $\lfloor 999/18 \rfloor - \lfloor 99/18 \rfloor = 55 - 5 = 50$. Done in 5 seconds.
An integer divisible by both $6$ and $9$ must be divisible by their least common multiple, $\text{LCM}(6, 9) = 18$. We seek the number of multiples of $18$ in the interval $[100, 999]$. The smallest multiple of $18$ greater than or equal to...
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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