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January 16, 2018 - Math Olympiads for Elementary …

ContestPlease fold over on line. Write answers on 2008 by Mathematical Olympiads for Elementary and Middle Schools, Inc. All rights Elementary and Middle Schoolsfor Elementary and Middle Schoolsfor Elementary and Middle Schoolsfor Elementary and Middle Schoolsfor Elementary and Middle SchoolsMathematical OlympiadsMathematical OlympiadsMathematical OlympiadsMathematical OlympiadsMathematical Olympiads 4 ATime: 4 minutesA digital clock shows 2:35. This is the first time after midnightwhen all three digits are different prime numbers. What is thelast time before noon when all three digits on the clock aredifferent prime numbers?

NOTE: Other FOLLOW-UP problems related to some of the above can be found in our three contest problem books and in “Creative Problem Solving in School Mathematics.” Visit www.moems.org for details and to order. METHOD 2 Strategy: Use spatial reasoning. The area of the original rectangle is 8 212 = 96 cm .

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