AMC 8 L1: Calculation Tricks

Complete problem set with solutions and individual problem pages

Problem 1 Easy

There is an arithmetic sequence 2, 4, 6, 8, \cdot \cdot \cdot. The 20^{th} number is            .

Answer:40

Solution 1: 2+(20-1)\times2=40

Solution 2: 2\times20=40

Related Problems
Problem 2 AMC 8 L1: Calculation Tricks
Problem 3 AMC 8 L1: Calculation Tricks
Problem 4 AMC 8 L1: Calculation Tricks
Problem 5 AMC 8 L1: Calculation Tricks
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