All About Sudoku for Kids

September 9 is International Sudoku Day, but this fun number game is great to play — for kids and adults — any day of the year.

If you’ve never played it before, Sudoku is a logic-based number puzzle game. It is played on a 9×9 grid, with some of the cells already filled in with numbers. The objective of the game is to fill in the remaining cells with numbers 1-9 so that each row, column, and 3×3 subgrid contains all of the numbers from 1-9 exactly once.

The grids can vary in degree of difficulty based on how many grids are connected and how many numbers are shown to start with. Kids need a basic understanding of numbers, logic and patience to complete a Sudoku game, so it’s recommended for kids ages 7 and up.

For kids, you can start with specially designed, easier puzzles that have 4×4 grids or 6×6 grids instead of the usual 9×9 grid. It can also be helpful to have more of the grid filled in when they start so they can get the idea of how the puzzle is supposed to work better.

For instance Kids Math Games Online has printable Sudoku puzzles for all skill levels, starting with a 4×4 grid (which only uses the numbers 1-4) with as many as eight of the grid spaces filled out to make it easier for kids new to the game to solve it.

More good Sudoku games for kids can be found here:
Sudoku for Kids
Puzzles to Print
Math in English (also has puzzles with shapes or letters instead of numbers)
Cool 2B Kids
Science Kids (also has a blank template for devising your own games)

You can also try the online games at Sudoku Online. That page also has good tips about trying Sudoku with kids, probably the most important being to explain the rules very clearly, and to help them with their first few puzzles but let them make mistakes so they can figure out how to do it on their own. And of course there are apps you can use to play Sudoku at any skill level.

Do you play Sudoku or do your kids? I’d love to hear about it if you play together!

[Photo: Kids Math Games Online]

A classic manipulative in the preschool and early elementary classroom is the snap cube, also known as math cubes, unifix cubes or unit cubes. These little one inch cubes often come in a set of 100 in 10 different colors, and they snap together so they’re easy to use for all sorts of math learning, measuring and more.

No Time for Flashcards has a cute robot printable to use with cubes to measure the height of each robot. That one is free but they also have other printable cube mats that are a paid resource.

Catherine & Co uses math cubes to teach kids about measuring volume. They make a letter from cubes and then measure the volume (there’s a printable worksheet in the post).

Pattern recognition is another fun and easy activity you can do with the cubes. You can use printables like these from Planning Playtime, or just make a pattern from cubes and have kids repeat it or figure out what comes next. There’s another good set of pattern printables at English Created Resources.

Because there are 10 sets of 10 cubes in a pack, these are great for teaching one to one correspondence, counting, sorting and basic addition and subtraction. English Created Resources has great printable number mats you can use to form the number from cubes and count out the number of cubes that corresponds to that number.

ParenTutor has a great collection of snap cube activity ideas, most of which are just pictures, but it’s work taking a look through the post for ideas for using them at home or in the classroom.

To give just a few of their examples, you can match linked blocks to the corresponding number of pieces, use blocks to find different ways to add up to 10, compare numbers and determine which one is more or less, skip counting and weighing different numbers of blocks.

You can also use unit cubes to learn letters, like with these super cute alphabet mats from Fun Learning for Kids. Kids can trace the letter, make it out of cubes and practice writing a word that starts with that letter.

Of course you can also use them to build things, since they are blocks, and there are tons of pattern mats on Teachers Pay Teachers. I also love these dinosaur themed mats from Lets Go to Learn on Etsy.

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