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You are here: Home / Learn / Math Activities / Compute & Find: A Secret Code Activity for Kids

Compute & Find: A Secret Code Activity for Kids

March 18, 2015

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Want to get your kids to practice math, handwriting, sounding out words, sleuthing and have fun all at the same time? This secret code activity is for you. I’ve been wanting to do secret codes with the kids for a while, and since it fit the bill of this week’s STEAM POWER theme of “compute,” the timing was right.

Secret code activity that can be adapted to the interest of your child.

I set up our secret code activity around superheroes, but you can certainly switch things up to suit your child’s interest. Or, better yet, you can simply introduce the idea of secret codes and let them do all the creative work. (My personal favorite.)

The first order of business was to create a simple decoder for the kids to use. As I said, it’s good to let your kids make their own, but since I was setting this up for a much needed after school distraction, I prepped the activity ahead of time. (Never fear, my fellow lazy parents, it took much less time than I thought.) I knew I wanted to include a math component for my computing-loving kids, and I had high hopes that a crack the code activity would be a fun handwriting activity for my youngest. (Note: this post contains affiliate links.)

How to make the secret code generator

This secret code formula is a basic one you will no doubt recognize from your own childhood. I got the idea to use a slider from the Top Secret: A Handbook of Codes, Ciphers and Secret Writing, a book my son has been enjoying. It has all sorts of goodies in it for your spy-in-training.

You can probably figure it how to make it by looking at the photo, you are so clever. The key is to make the strip longer than the colored paper and to cut slits that are slightly larger than the strip, so it glides smoothly.

Secret code activity for kids with a slide decoder.

Write the alphabet on the colored paper. I put an alphabet on one side of the strip and a number line on the other, with extra letters and numbers on each end, as shown.

How to use the secret code generator

I probably don’t have to explain how to create the codes to you clever, clever people. There are several ways to keep things interesting.

Simple code:

Line up the alphabet to the numbers so that A=1, Z=26, etc. This will help kids practice one to one correspondence. In other words, CAT would be written 3-1-20.

Ever so slightly more challenging code:

Lining up the alphabet to alphabet or alphabet to number line, the slider can be moved back and forth. A new code might be “number line +1” so that A=2 and so forth. So, CAT would be 4-2-21. “Alphabet +1” would be A=B, so CAT is written DBU. You can see how your kids can use this formula to come up with different codes.

Secret code activity with math component.

Decoding activity for mathematicians:

For my youngest son I kept the codes at the “ever so slightly more challenging” level, but for my older kids, a fun way to have them practice their “power facts” (as they are called at our school) is to add a computing level to the decoding process. So for example, using the A=1 code, I would write the clue for CAT as 1×3 1×1 4×5. You can, of course make these equations simple or complex to suit your child’s skill. And perhaps, your child will even write something in code for you to crack!

Secret Code Hunt Activity

I made several messages for the kids to decode, but then I hit upon the idea of a scavenger hunt with superheroes.

Decoding a superhero secret code.

I created coded messages for the kids: “Find Batman” and “Rescue Green Lantern” and wrote a series of clues, which I then hid around the apartment. The boys decoded each clue, which led them to another coded clue, and so on until they found their action figures.

Secret message in code with clue.

I was really surprised at how much they adored this activity! My youngest did not even ask me to do the writing for him, which was completely and totally awesome. He also worked hard to sound out words (something he hates). In fact, they begged me to create a new one for the next afternoon. (Which I did, thank you very much.)

Superhero secret code activity scavenger hunt for kids.

So there you have it. A super successful activity that combines math, handwriting, a bit of fun and perhaps a superhero or two. My next challenge is to get the boys to create coded scavenger hunts for each other. We shall see…..

Want more 52 more STEAM activities? Get the free list, plus step by step instructions for 2 sample projects. Sign up here. 

STEAM ideas list

MORE SUPERHERO FUN:

  • Superhero science activities
  • Make a giant comic strip
  • Superhero books

MORE MATH FUN:

  • Tens go fish
  • Easy math game: Fiverton
  • Make 10 card game
  • Math art projects

STEAM learning series

Put your kids’ brains on compute mode with more STEAM projects from the STEAM POWER team!

  • Patterned multiplication circles at Lemon Lime Adventures
  • Backyard coding game for kids at Left Brain Craft Brain
  • Make a PVC pipe xylophone at Frugal Fun for Boys
  • Spring Glyph at Meri Cherry
  • Easy Math Trick at All for the Boys
  • Flextangles at Babble Dabble Do

Happy computing!

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by: Erica posted in: Math Activities 7 Comments

« Superhero Science Activities: Test Your Powers!
Family Literacy: How to Memorize Poetry with Kids »

Comments

  1. Suzanne says

    March 19, 2015 at 8:18 am

    I cannot even tell you how fabulous you are for posting this today! Spring Break starts at 3:40 tomorrow afternoon and I had no clue what I was going to do with my girls. (The week kind of snuck up on me!) Problem solved!! They will love this, especially my 8 year old. Thank you so much for sharing your great ideas.

    Reply
    • Erica MomandKiddo says

      March 19, 2015 at 8:21 am

      Hooray! I’m so glad it will help you get through Spring Break! Thanks for your comment.

      Reply
  2. Ana says

    March 19, 2015 at 12:45 pm

    Who doesn’t love secret codes? I love the tie-in to superheroes too!

    Reply
  3. nabila says

    August 13, 2020 at 6:20 am

    I loved this so did my kids and they did not start yet
    they are so excited to do this coding game
    where can i find scavenger hunt game with coding?

    thank you

    Reply
  4. TechyKids says

    August 20, 2020 at 3:58 am

    The secret code activity which you have shared to teach coding to kids seems really interesting. In this digital age, the importance of coding to kids has great benefits to their overall growth. It not only improves their problem solving abilities but boosts their confidence to a next level. Such great activities which you have mentioned in the blog will be really helpful in improving the logical thinking of kids. We at TechyKids Canada aims to provide excellent coding knowledge to all students which makes learning fun & interactive. Thanks for sharing this!

    Reply
  5. Jen Houser says

    January 14, 2021 at 4:30 pm

    Just did this with my 8 year old son who HATES writing….he LOVED it! thank you!!!!

    Reply
    • Erica says

      January 20, 2021 at 8:43 am

      That’s wonderful!

      Reply

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