Over the past week, thousands of middle school students have participated in this year’s AMC 8 Competition. Whether you took the AMC 8 at school or online, we hope it went well!

The last day of testing was November 16th, so now the problems can be discussed! See below for an answer key for the 2020 questions as well as the concepts tested on each problem.

**1**

**E**

arithmetic: ratios

**2**

**C**

arithmetic: averages

**3**

**D**

geometry: areas and units

**4**

**B**

counting and probability: patterns and geometry

**5**

**C**

arithmetic: fractions and percents

**6**

**A**

logic and orderings

**7**

**C**

counting and probability: digits and possible numbers

**8**

**C**

arithmetic: value of coins and logic

**9**

**D**

geometry: cubes, surfaces, and spatial reasoning

**10**

**C**

counting and probability: complementary counting

**11**

**E**

algebra: motion, averages speed, and graphs

**12**

**A**

algebra: factorials and rewriting expressions

**13**

**B**

arithmetic: ratios and probability

**14**

**D**

arithmetic: graphs, averages, and estimation

**15**

**C**

algebra: percents

**16**

**E**

algebra: sums and equations

**17**

**B**

number theory: factors and number of factors

**18**

**A**

geometry: circles, rectangles, and Pythagorean theorem

**19**

**B**

number theory: divisible and possible digits

**20**

**B**

arithmetic and logic: averages and remainders

**21**

**A**

counting and probability: counting paths and patterns

**22**

**E**

number theory: sequences and recursion

**23**

**B**

counting and probability: cases and logic

**24**

**A**

geometry and algebra: areas, percentages, and ratios

**25**

**A**

geometry and algebra: lengths and equations

This year’s AMC 8 problems are available on the ZIML site by clicking here (either as a Mock Exam or PDF). While you’re there, check out the Daily Magic Spells and Monthly Contests for extra practice!

The AMC 8 exam is administered by the Mathematical Association of America (MAA). For general information about the AMC 8, click here.

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