2024 AMC 8 Problems/Problem 1
Contents
Problem 1
What is the ones digit of
Solution 1
−
We can rewrite the expression as
−
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We note that the units digit of the addition is because all the units digits of the five numbers are
and
, which has a units digit of
.
−
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Now, we have something with a units digit of subtracted from
. The units digit of this expression is obviously
, and we get
as our answer.
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i am smart
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~ Dreamer12
Solution 2 (dumb)
222,222-22,222 = 200,000 200,000 - 2,222 = 197778 197778 - 222 = 197556 197556 - 22 = 197534 197534 - 2 = 1957532
So our answer is .
Solution 3
We only care about the unit's digits.
Thus, ends in
,
ends in
,
ends in
,
ends in
, and
ends in
.
~iasdjfpawregh ~hockey
Solution 4
uwu
Solution 5
We just take the units digit of each and subtract, or you can do it this way by adding an extra ten to the first number (so we don't get a negative number):
Thus, we get the answer
- FU-King nice
Video Solution 1 (Quick and Easy!)
~Education, the Study of Everything
Video Solution (easy to understand)
https://youtu.be/BaE00H2SHQM?si=O0O0g7qq9AbhQN9I&t=130
~Math-X
Video Solution by Interstigation
https://youtu.be/ktzijuZtDas&t=36
See Also
2024 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by First Problem |
Followed by Problem 2 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
All AJHSME/AMC 8 Problems and Solutions |
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