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Prime numbers are like the Lego bricks of number theory, and if you’re a real math nerd you know you love number theory. But wading your way through a sea of composite numbers looking for those magic numbers at either end of the scale, either the noble primes themselves or those composite numbers with who have a really interesting family tree of primes that multiply out to their true quantitative majesty…

So, what every number explorer needs is a prime factorization calculator, and I just built a really fun one here. It’s animated. And in color. And perfect for playing with numbers in the classroom, on your Smart Board or just whenever you’ve got a number that seems like it’s got an interesting prime pedigree…

Prime factorizations are a great tool for figuring out greatest common divisors (or largest common denominators if that’s how you swing), or for finding the least common multiple. But naturally, this calculator will tell you quite promptly if a number is prime as well.

Give it a try and see what you can discover about your own favorite number. It’s factor tree may actually surprise you…

The poor countdown timer here at DadsWorksheets has been neglected for some time, and with the site having gone through some significant technology upgrades, the timer became something of an orphan child, replete with scars and an inferiority complex, you know that one you keep in the closet and hope that at some point it’s just going to have an owl swoop in with an engraved invitation to go off to magic timer school where it saves the world or something.

After waiting somewhat impatiently for ANY sort of feathered visitor, I had to take matters more into my own hands, and a few thousand lines of JavaScript incantation later, I’m pleased to share with you the new countdown timer…

You don’t need to invoke *specialis revelio* to see this is a wizardly improvement over the old timer. Obliviously one big change is the circular timer graph, which provides immediate feedback about how far along the timer has progressed. It also lets you trigger sounds when the timer reaches the halfway mark or nears the end of the time you assign, and there are preset buttons like “Set Timer for 10 Minutes” and similar amounts that let you very quickly configure the timer for frequently used times.

As with the previous timer, you can save a URL that has all of your specific settings so that it’s easy to return to a timer ready to go.

While we’re using this as a timer for math tests and worksheets, it’s perfect for anything where you need a countdown. Use it as a classroom timer, a recipe timer or to keep track how long that *pectrificus totalus* is going last.

*Accio Timer!*

Percentages are an important part of both math and daily life. We deal with percentages all over the place… Calculating tips, 50% off sales, sales tax, or (dare I mention it in April?) income taxes. All of these areas work with percentages.

This percentage calculator easily allows you to convert a percent to fraction or, in reverse, a fraction to percent. By playing with the various values, you can work out various types of problems (“what percent of a number is some other number” for example), and the spoken-word version of various types of problems is shown in the preview. Working various problems through the calculator will quickly build experience with various types of percentage problems.

Also be sure to check out the various fraction and percentage math worksheets on the site for more practice.

Friends! In this era of polarized political punditry, care must indeed be taken to avoid tarnishing with undeserved negativity the very verbal tools we employ. Even supposing the differences found in our associates, our family members or our beloved (or, not so much) electoral candidates are themselves perhaps less important than they seem (or, perhaps, even more not so much), irrespective of nuance, the words we use may escalate these comparisons to Brobdingnagian proportion, and in doing so toss those loyal lexical minions into the political muck.

I loathe to say that such a fate befalls our dear associate “division” and his close kin, which in political parlance has accumulated such a dreadfully undeserved connotation. Subtraction? So negative. But division, yes, division we need by our side in its purist form. This mighty mathematical sword brings so much to our struggle for the equitable partitioning of cakes and other deserts, the proportional reduction of recipes for the making of optimistically smaller quantities of these and other tasty treats, and, importantly, the required percentage calculation of caloric reduction to target weight loss after over indulgence in what may have ultimately been a non-equitable distribution of said dessert portions.

Indeed, without division, we would all be, colloquially, fat cats.

So, take cautious heed not to bandy about words such as division or divided or divisiveness with abandon lest you too sully the reputation of this fine arithmetical specimen. Instead, share with your friends these shiny new division facts worksheets that are designed to fill an otherwise unnoticed gap in the division content on the site. They will hone your skills with basic division facts grouped by distinct divisors.

And, they’re vastly more fun than watching the primary debates.

Sometimes, it’s really just all about pie. Who gets how much pie. How many pieces of pie. Fractions of pies. Big fractions for me, please.

When you are learning how to add or subtract fractions, it’s easy enough to get the whole common denominator thing figured out. I mean, if Uncle Billy ate half of the cherry apple, you know you’re only going to have a third of the pie left after you take your traditional one sixth slice. Denominators of two and three and six… It’s just basic pierithmetic.

But multiplying and dividing, that requires skills. Serious skills. And that’s where this fraction calculator might come in handy. Whether you have to deal with mixed fractions or improper fractions, or if you just need a little help with the core operations on simple fractions, this calculator is built just for you. It will reduce and simply anything you put into it, and along the way give you a visual preview to help show what’s going on. Check out the YouTube video in this post for a quick demo, or just go straight to the link below.

Also works great for pizza. Because, you know. Pizza is a pie, too.

Sometimes a letter size piece of paper is just too much, even for a 100 multiplication facts. Sometimes you just need something a little more discrete, something that you can slip into your pocket, something you can reach for on a moment’s notice without the social stigma that comes from unfurling a giant multiplication chart out of your backpack and announcing you can’t remember the product of 6×7 to the world. Again.

Well, maybe not you, but maybe one of your budding math minions.

These miniature multiplication charts are the answer! They’re laid four up to the page, ready for your local neighborhood (or supply room) paper cutter. They’re great for taping to student desktops or math notebooks or any place where a little multiplication help might be called for. Check them out, along with their full-size brethren at the link below…

Oh, and it’s 42 by the way. Put the chart away, seriously. It’s embarrassing.

Are your students missing the target when it comes to learning math facts? These cool new bullseye worksheets can help!

Students get bored easily with the same worksheets over and over again, but there’s no substitute for simply working the problems until the facts are mastered. These worksheets are another interesting approach that helps engage students in ways beyond just pushing the pencil down the line and filling in the answers. Try these and the spiral worksheets for a change of pace and see how much faster those math facts get memorized!

**Bullseye Addition Facts Worksheets**

**Bullseye Subtraction Facts Worksheets**

[Update: I was able to make a change to the worksheet printing style sheet that seems to have corrected the issue. The site has been refreshed. If anyone is still experiencing problems, please leave a comment in this post with the URL of the page that is causing problems… Thanks for everyone’s patience!]

Google this week began rolling out version 47 of its Chrome browser. Unfortunately, this version has broken some of the behavior used to change the way things are printed versus drawn on the screen. Printing many of the worksheets right now causes the pages to be split onto two pieces of paper with an enormous amount of blank space at the top of the first page.

I’ve spent two days trying to put together a work around, and I’ve also reported a bug to Google. I’ll continue to attempt to find a solution to this problem.

In the meanwhile, if you are experiencing printing problems, please use Firefox, Safari or Internet Explorer.

I’m sorry for any inconvenience and will work diligently to get a solution in place.