2014 - Page 26 of 27 - Math and Multimedia

Explore Solid Nets Apps and Print Models

February 2, 2014 GB High School Geometry, High School Mathematics, Resources and Freebies

Are you looking for solid nets resources, printable worksheets, or interactive apps? Check out the five websites below. These sites contains resources about solids, their properties, and their nets. Printable nets are also available.

Annenberg Media has an interactive page on Platonic solids, prisms, and pyramids. It allows users to rotate 3d shapes and see how the solids are formed from their nets.

Illuminations has a page that lets you explore nets of Platonic solids. What is good about this interactive program is that it also allows you to create your own net.

Math Interactives allows users to explore the relationship between the volume of the solids and their nets. Users can also check if their visualization skill by predicting the top view, front view, and side view of the solids.

solid nets

Maths is Fun – Maths is fun has a page about Platonic solids. The resource includes properties, printable nets, as well as 3d interactive animations.

SEN Teacher is a website that provides free learning materials. The website has free printable nets of polyhedra which is available in PDF. The website also allows users to create customize nets putting images on them creating “photonets.”

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How Many Zeros Are There in n factorial

January 25, 2014 GB High School Algebra, High School Mathematics, Problem Solving and Proofs

How many trailing zeros are there in 100! (! is read as factorial)? This is one of the most common problems in elementary school and middle school math competitions and for those who have memorized the strategy, this can be solved in less than five seconds. There are (100/5) + (100/25) = 24 trailing zeros in 100!. But why does the trick works?

Small Cases

Example 1: How many zeroes are there in $6!$ ?

For those who are new to the factorial notation, when we say $6!$ , we mean that we multiply $6$ and $5$ and $4$ all the way down to $1$ . That is

$6! = 6 \times 5 \times 4 \times 3 \times 2 \times 1 = 720$ .

So, where did all the zeros come from? Zero came from 5 multiplied by any even number factor. For example, in $6!$ , if we multiply $6$ and $5$ , this will give us 30, a number with one trailing zero. Notice that none of the remaining numbers in the multiplication can add another trailing zero. » Read more

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7 Funny Math Comic Sites You Will Love

January 18, 2014 GB Fun and Jokes, High School Mathematics, Math Lite

Mathematics is difficult to many, but it sometimes can be fun as well. And luckily, there are creative and gifted people who never stop from making the subject light and funny. In this post, we look at some of the funny math sites on the web, particularly those who publish math web comics. Enjoy browsing the list!

1. XKCD – XKCD is a web comic of romance, sarcasm, and language. Among the three, I think sarcasm is the most successful (lol). In its home page, it says that “This comic occasionally contains strong language (which may not be suitable for children), unusual humor (which maybe unsuitable for adults), and advanced mathematics (which maybe unsuitable for liberal arts majors).” A web comic of sarcasm indeed.

2. (x,why?) – A math comic sites written by Chris Burke. The blog also contains some math jokes and also serious math sometimes. Mr. Burke usually allows bloggers to use his comics on blogs (I asked him two years ago) as long as you ask his permission. » Read more

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