## Secret codes

This is where all that we have learnt comes together. Secret codes. First, to get a brief introduction, please take time to watch the short video. Secret codes can be …

## Solution to operator part of the course challenge

Watch the video to learn about the ‘cyclic number’ operator that we invented!

## Operator part of course challenge

OK! Let’s get down to the final part of the course challenge: What is the meaning of the operator: ‘house’? You can ask for hints in the discussion, but don’t …

## Operator crosswords

Operator crossword puzzles are real fun! Here is a great site where you can try to solve some operator crosswords of the first type and here are some operator puzzles …

## Farewell!

So! We have reached the end of the course. I would like encourage you to join one of the many groups around the world that are active in recreational math …

## Math and Science-by-Mail

Math and Science-by-Mail used to be two of the most popular recreational math and popular science online clubs for kids ages 10-12, run by the Davidson Institute of Science Education. …

## Just before we leave…

Just before we leave, I would like to tell you a bit about how important I feel it is to incorporate topics such as what we have just learnt in …

## What have we done?

Before we formally summarise the course, watch the video to reflect on some of the things we went through together during the course…

## Operator notation

It is worthwhile mentioning that there are many different notations for operators. The usual notation that we use is to write arithmetic expressions with the operator between the operands: 2 …

## A bit of history – different ways operators were symbolised through history

Probably the most difficult task a mathematician or a math historian encounters in their day-to-day job is understanding the language. The language of math is symbolic. There are symbols for …

## Other modern operators

At this stage you may be wondering if ternary operators (operators that work on three operands) exist? Maybe even more than three? Indeed, there are operators that operate on more …

## Logic operators

Logic is one of the most interesting branches of math. It is a very broad discipline of which we will learn only a small part here: matters of “true and …

## Identity and Inverse Operators

Some operators have a special role in in mathematics, especially in group theory. Two such operators are the identity operator and the inverse operator. The identity operator When this operator …

## Unary and binary operators

Operators that operate on two operands are known as binary operators. Operators that operate on one operand are known as unary operators. Watch the video to learn about binary and …

## Introduction to operators

This week we’ll move away from number symbologies and take a look at operators and operator puzzles. An operator describes an action performed on numbers or on other elements, like …