2026 AMC 8 Problem 9

Attempt Problem 9 of the 2026 AMC 8 below, then check your answer against the video solution and professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2026 AMC 8 solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

9.

What is the value of this expression? 16818116 \frac{\sqrt{16\sqrt{81}}}{\sqrt{81\sqrt{16}}}
49\dfrac{4}{9}
23\dfrac{2}{3}
11
32\dfrac{3}{2}
94\dfrac{9}{4}
Answer: B
Concepts:radical
Small hint:
Evaluate the inner square roots first
Big hint:
The numerator is 16⋅9\sqrt{16\cdot9}, and the denominator is 81⋅4\sqrt{81\cdot4}
Video solution:
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Written solution:
The numerator is 1681\sqrt{16\sqrt{81}} =16⋅9=\sqrt{16\cdot9} =144=\sqrt{144} =12=12. The denominator is 8116\sqrt{81\sqrt{16}} =81⋅4=\sqrt{81\cdot4} =324=\sqrt{324} =18=18. The value is 1218=23\frac{12}{18}=\frac{2}{3}.
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