One of the strategies in solving problems is to divide them into cases and see if you can eliminate some impossible cases. In this post, I will discuss a popular classic problem which I found the solution to be interesting. Problem If A, B, C, and D are distinct non-zero digits, find their values if […]

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# Problem Solving and Proofs

## How Many Zeros Are There in n factorial

How many trailing zeros are there in 100! (! is read as factorial)? This is one of the most common problems in elementary school and middle school math competitions and for those who have memorized the strategy, this can be solved in less than five seconds. There are (100/5) + (100/25) = 24 trailing zeros […]

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## The Math Word Problem Series on Number Problems

Below is the Number Word Problem Solving Series among the Math Word Problem Series in Math and Multimedia. In this series, several strategies were discussed on how to solve number problems. 1. How to Solve Number Problems Mentally 2. How to Solve Number Problems Using the Model Method 3. How to Solve Number Problems Using Algebra Part 1 […]

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