2024 AMC 8 Problem 1

Attempt Problem 1 of the 2024 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 2024 AMC 8 solutions, or check the answer key.

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

1.

What is the ones digit of 222,222−22,222−2,222−222−22−2?\begin{align*} & 222,222 - 22,222 - 2,222 \\ &- 222 - 22 - 2? \end{align*}
00
22
44
66
88
Answer: B
Concepts:units digit
Small hint:
Only the ones digits affect the ones digit of the result
Big hint:
Compute the ones digit of 2−2−2−2−2−22-2-2-2-2-2
Video solution:
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Written solution:
Only the ones digits matter. Modulo 10,10, the expression is 2−2−2−2−2−2=−8,−8≡2(mod10). \begin{gathered} 2-2-2-2-2-2=-8,\\ -8\equiv2\pmod{10}. \end{gathered} Therefore its ones digit is 2.2.
Thus, B is the correct answer.
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