Can an Endless String of Numbers have a Sum?
If you tutor math 12, you’ll have come across the premise 1 + 1/2 + 1/4 + 1/8 +…. Before we go any further, a reminder on how to multiply fractions: (2/3) x (4/5) = 8/15. You just multiply the …
Category: math
Divisibility by 3, Divisibility by 9
During math tutoring, no matter what the level, the front line is arithmetic. In that spirit, here’s a handy trick to tell if a number is divisible by 3: Add up the digits. If the sum is divisible by 3, then so …
Simplifying Radicals…part I
Hello. One of the most dreaded topics in high school math – as you’ll quickly find out if you do math tutoring – is radicals. Well, here’s our first math post: simplifying radicals. Today, we’ll look at square roots only. …