Here’s a simple question for you to answer, which number is larger 55 or 23? The answer is of course 55, most of us can answer this question in less than 0.5 seconds. But there are a few who will take as long as 3 seconds. These people may have something called dyscalculia. Dyscalculia (also known as number blindness) is a condition in which a person’s number sense is defective. People diagnosed with dyscalculia usually have problems correlating they symbol for a number (for example 7) with the number of objects the symbol represents. Counting is also difficult for them. This of course…

# Category: mathematics

# Why estimating should be an important part of every math class

“How long does it take you to drive to work” is a very common question asked, have you ever noticed that the answers we get to this question is almost always a range and never a precise single number? As in “About 15 – 20 minutes” as opposed to “18 minutes”. When it comes to answering questions dealing with quantity (like how long it takes to drive to work) we seem to be incapable of giving a precise single number as answer. When asked how “How many people showed up to the Christmas party?” we answer “about 100, 150”. When…

# Why the Metric system is not always superior to the Imperial system

As a Canadian I love to joke about how much more sense our measurement system (the metric system) is than the American system (the imperial system). Its always nice to get a few jabs in on our neighbors to the south. Helps me feel better about my country when I can put another country down just a little bit. The basis for believing that the metric system is superior to the imperial system is that is less confusing than the imperial system. The metric system measures things using units such as meters (for length) or grams (for weight) and adds prefixes such as kilo,…

# If The World Were 100 people …

12 would speak Chinese 6 would speak Spanish 5 would speak English 4 would speak Hindi 3 would speak Arabic 3 would speak Bengali 3 would speak Portuguese 2 would speak Russian 2 would speak Japanese 60 would speak other languages Surprising? Source: http://www.100people.org/statistics_100stats.php?section=statistics

# The Man Who Hated Math

Former British Prime Minister Willian Gladstone hated math. He hated math so much that when he was in university he wrote a letter to his father asking to be transferred to a University that did not offer any classes in math. As a member of Parliament Gladstone’s father could have easily arranged for a transfer to a “no math” university for his son, but instead he replied “You say that you dislike math, but there is a supreme pleasure to be found in putting all your efforts into a subject that you dislike. You may be faced with a time…

# Subway Map that makes Studying for Advanced Functions Easier!

Studying for an exam in mathematics is not fun for many students. The biggest complaint I get about studying for a math exam is the amount of concepts that have to be reviewed in order to prepare. I always feel disappointed when I hear students tell me how much anxiety preparing for a math exam is causing them. As a mathematics teacher I always hope students can see how the concepts we work on over the semester connect with each other (wishful thinking on my part I know!) . Ideally by the time exams come around they understand the concepts so well (because they see the connection between…

# Secrets Behind Math Magic Trick Unveiled !

Here is a neat math trick I learned from Alex Bellos’ book “Here’s looking at Euclid”. The Trick Start by picking any three digit number where the first and last digits differ by at least two. For example 421. The revers it’s digits … 124 Subtract the smaller number from the bigger number 421 – 124 = 297 Reverse this result and add the two numbers … 297 + 792 = 1089 Now try this with any other three digit number whose first and last digits differ by at least two … say 519 reverse of 519 is 915 difference…