Take the CSM Challenge: Advanced Percents

Question: If 99.5% of computer keyboards do NOT have keys that stick, 1 in how many computer keyboards DO have keys that stick?

Click here to check your answer

What is number sense?

One of the goals of CSM is to build your number sense -- a deep sense of how numbers fit together, and what they really mean. In the problem above, for example, it's easy to think of 99.5% as almost all -- but that's not very helpful. And if you think of 99.5% and 99.995% both as almost all, you wouldn't see that the first is 1 in 200 and the second is 1 in 20,000!

With CSM, you'll learn to see numbers in a different, more confident way.


Take the CSM Course to learn how to do problems like this and build your High Performance skills (like persistence, self-reliance, and problem-solving).

When you complete the CSM Course, you'll earn your CSM Certificate to show employers that you have what it takes!

I want to take CSM!

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