RS2 Level F, Lesson 105

Lesson 105 in RS2 Level F is titled Dividing Fractions on a Fraction Chart. This lesson is very critical to understanding division of fractions. Yes, when dividing fractions we are generally taught to just invert and multiply. But why? Why does this … [Read more...]

Dr. Cotter on Problem Solving

A few years ago while on a shuttle to speak on math at a convention, I started talking to a young man next to me. When he found out I was involved in math, he said he could solve story problems as long as someone told him what operation to use. The … [Read more...]

RS1 Level G, Lesson 92

We just had a student email us with questions about Level G, Lesson 92. Well, actually, it was Worksheet 92-2, problem 5. Obviously, we need to see what the problems looks like. Here is the first problem. We are given an object and are to … [Read more...]

RS1 Level G, Lesson 121

We've had a few calls about Lesson 121, Fibonacci Numbers and Phi, from Level G. This is a hard one, but, oh, what fun when you get it! So, rather than type a long winded explanation and have you read it, I decided to make a video for you. … [Read more...]

RightStart™ Manipulatives

What’s so special about the manipulatives used for the RightStart™ Mathematics program? Let’s run through the list. NOT AVAILABLE ELSEWHERE: AL Abacus: This abacus has 100 beads, is grouped in 5s and 10s using color. It is different from the … [Read more...]

12 Square Inches vs 12 Inches Squared

In RS2 Level C, Lesson 109, the child is introduced to measuring area. After a problem of square inches is discussed, the lesson shows the child how to write 12 square inches: 12 in². Then, there's an explanation on the side that reads: Be sure to … [Read more...]