🏃🏻❌💡 While tutoring students who are in the process of multiplying two numbers, I sometimes challenge myself by trying to do the multiplication in my head instead of using a calculator. I don't know where I learned it, but I usually take a divide-and-conquer approach to multiplying large numbers, a large number for me being … Continue reading Two (perhaps) quick(ish) ways to multiply two digit numbers in your head

# Ebook Mystery Word Problem!

💻🤔📕 I have recently been reading an ebook* that is quite long and has endnotes. Because my ebook reader only tells me my current positions in the actual body of the book and the endnotes, I have been wondering how much of the book I have actually read. Right now, my reader tells me I'm … Continue reading Ebook Mystery Word Problem!

# To cross multiply or not cross multiply

When I was in Grade 7 our homeroom/math teacher told the class in a hushed voice, “Don’t cross multiply.” At the time I didn’t understand what he meant, nor did I likely understand what cross multiplication was. Ever since I have occasionally wondered why he would admonish students from using such a useful tool. Cross-multiplication … Continue reading To cross multiply or not cross multiply

# Algebraic Expressions vs Algebraic Equations

Give the algebraic expression that represents the perimeter of the following polygon. Over the last five years working as a tutor I have seen many students struggle with a problem like the one above. To answer it we must remember that the perimeter of any shape can be found by adding up its side-lengths. With side-lengths that … Continue reading Algebraic Expressions vs Algebraic Equations