Comment

Hi Howard. Cool printouts.

One thought on your encryption key cut out: if your kids are still having trouble remembering which way to encrypt and which way to decrypt -- just make a self-reversing wheel. Change the order of the letters on the inner wheel to be the reverse of the letters on the outer wheel. Encryption and Decryption then use an identical algorithm.

Proof that this is the case is rather trivial. Let each letter be identified by an integer 0 to 25. Reversing the inner ring is in effect performing the operation
`F(n) = c - n mod 26`.
All you need to do is examine what `F(F(n))` yields.

Of course, a child having this information might more easily crack their siblings secret messages, but this might be a desirable attribute for younger children.

—Trent Tobler

Thanks Trent, for the good idea. You are (as always) quite correct, so I have updated it.

Other Printables

Need ruled paper large enough for a kindergartener? How about practicing your numbers? Here ya go…

Comment

I am so excited to find this! My son is autistic so we have to do LOTS of practice work. I'm so tired of trying to hunt down writing lines. Thanks so much for taking the time to do this. Much appreciation!!!

—Luna
Comment

I just want to thank you for putting free things for me to use with my kindergarten class. As you probably know I already spend quite a bit each year for this and that for my youn uns! It's refreshing to find quality free things.

Thanks again,

—Diane
Comment

I just want to thank you for putting free things for me to use with my kindergarten class. As you probably know I already spend quite a bit each year for this and that for my youn uns! It's refreshing to find quality free things.

—Diane Crowe

## Printables for Children

With two young children who love to crayon their way through reams of paper, I've spent a fair amount of time scowering the web for printable coloring pages of all sorts. And when I have an itch to have the children do something more interesting, I often have to make it myself.

The following are various pages that you can print out and share with your children.

## Clock

Been teaching my daughter to tell time with one of those analog contraptions, but instead of forking over money for an adjustable clock, I figured I would make one that she can write on and build as well.

Yeah, the hands are pretty funny, but she's made a small collection of them in various colors, so allow your child to get creative on that one.

## Math Homework

There is a craze going around my neighborhood, where parents will spent \$100 a month to buy "math homework" called Kumon. I figured I could make it myself quite easily with this spreadsheet.

To use it, go to the equation at the bottom right corner of the sheet, and change the numbers to be the largest number possible for the top number and the bottom, and then change the operator to whatever you want, and print it.

Want a new homework page? Simply refresh the spreadsheet…

## Cryptographic Key

Being a geek in my soul (alright, I display it more overtly), I decided to explain encryption to my children, and built a simple Caesar cipher key engine. Ah, great fun, but the kids would get confused as whether they were encrypting by reading the letters outward or inwards.

Anyway, print two copies of this, and cut one of them on the inner circle, and shove a thumbtack through the center of both papers, and rotate until you have the desired position. Just remember at least one pair, so that you'll have an easier time of decrypting it.