Category Archives: Lessons

Lesson: Counting Divisors

How many positive integers are divisors of 650?  Can you figure it out without listing them all?  Watch this lesson and learn how:  Counting Divisors Advertisements

Posted in Lessons | Leave a comment

Lesson: Arithmetic Series and Sequences

Add the following numbers:  1 + 2 + 3 + 4 + … + 100  You have 30 seconds.  Go! Watch my lessons on Arithmetic Series and Sequences and learn to add lists of numbers like this quickly and easily.  … Continue reading

Posted in Lessons | Leave a comment

Lesson: Counting Lists of Numbers

I’ve posted my first lesson:  Counting Lists of Numbers Did you know you can count lists of numbers without actually counting them?  Hmmm… how does that work?  Actually you can count lots of things without actually counting them!  (Stay tuned … Continue reading

Posted in Lessons | Leave a comment