Slice Fractions is a free and ad-free math game designed for elementary students and available on PlayMath.org. Instead of memorizing rules or filling out worksheets, kids guide a woolly mammoth through icy puzzles, slicing obstacles and popping bubbles to explore fractions in action. The game is built for grades 2–6 and helps students visualize how fractions work by partitioning shapes, comparing sizes, and understanding parts of a whole. There are no timers, no instructions, and no pressure. Students learn by tinkering, trying, and discussing strategies with classmates, making math feel like an adventure instead of a chore.

Kristen Acosta, a veteran math educator from West Covina, California, has spent nearly three decades helping students and teachers discover that math can be innovative, engaging, and purposeful. She knows that fractions are one of the most challenging concepts for elementary students, who often struggle to visualize what numbers like ⅓ or ¼ actually mean.

Kristen was excited to review Slice Fractions because it gives students a way to “see” fractions, compare them, and build real understanding through play. Her classroom experience shows that when students use Slice Fractions, they’re not just practicing math, they’re talking, collaborating, and genuinely excited to learn.

Here’s what educator Kristen Acosta had to say about Slice Fractions and the PlayMath.org site.

For which grade levels do you think Slice Fractions is best suited? Why?

Slice Fractions is well suited for elementary grades, specifically 2nd through 6th. Using Slice Fractions in 2nd grade would help put a picture in students’ heads as to what is happening with regard to fractions. The game can be used for whole-group instruction, small-group instruction, enrichment, or intervention. Students can play with a partner or try it independently. 

Does the game align with any specific standards or curriculum guidelines?

Slice Fractions aligns with key fraction concepts in elementary math standards:

• 2nd Grade: Partitioning circles and rectangles into equal shares, using terms like halves, thirds, and fourths.
• 3rd Grade: Understanding fractions as parts of a whole and splitting shapes into equal parts.
• 4th Grade: Comparing and ordering fractions with different numerators and denominators.

How did you use Slice Fractions in your classroom?

Ordering fractions can be tough for students. Students can’t visualize that ⅓ is bigger than ¼. Since there’s a 4 in the denominator of one fraction, students usually think it must be bigger (compared to the 3 in ⅓). I have used clothesline math to help with ordering fractions with multiple representations, but students still have difficulties because they don’t have a picture created in their heads. One section of Slice Fractions has students figuring out ⅓ versus ¼. Students can physically see the difference between ⅓ and ¼. 

How did your students react to the games on PlayMath.org?

One thing I loved about our time playing games on PlayMath.org is that my class began investigating and talking about what other math topics PlayMath.org could gamify. They shared ideas about how to gamify decimal learning. This is exciting stuff!

A great feature—and benefit—of the Slice Fractions game is that my students needed time to tinker and play around with all parts of it. Completing a level turned into a full discussion of what to do first. Once they figured it out, my students progressed through the levels and chatted about how they got to each level and what to look for. Some memorable comments included:

• “Dude, you have to pop the bubbles!”
• “Who’s the elephant?”
• “No, I think that’s a woolly mammoth.”
• “What should we name him?”

Maybe these comments don’t sound educational to you, but here’s the thing: My class enjoyed the game so much they asked when we could play again. It became a whole-class event, with everyone participating and discussing solutions. My students were challenged by the physics aspect but gained a deeper conceptual understanding of fractions.

How easy was it to use Slice Fractions and implement it in your classroom?

Slice Fractions was easy to use in the classroom. It can be used for whole-group, partner work, individual, enrichment, intervention, or small-group/rotations/math centers. PlayMath.org could also be distributed to devices via Google Classroom.

What did you like most about Slice Fractions and any other games at PlayMath.org?

Slice Fractions is thought-provoking in that students have to use logic and reasoning to determine how to get the woolly mammoth on the path. 

Boo was intriguing to play too because it involved a lot of trial and error with the correct sequence. Who knew painting pumpkins could be so intense?!  

What makes PlayMath.org special or unique compared to other sites you’ve used in your classroom? 

PlayMath.org is significant for many reasons, including: 

1. The games and activities are not timed. Time should never be a factor if you are problem-solving in math. 
2. The website is completely free and doesn’t have any annoying ads. 
3. The games do not have any concrete written directions. Students need to use intuition to tinker with what’s in front of them. They get an infinite number of tries as well as a quick help video.

How will PlayMath.org save you time or make teaching easier?

Teachers struggle to find additional ways for students to practice their math. Worksheets are usually their go-to. Students need to be engrossed in their learning, but worksheets are boring and dull. Gamifying math piques their interest while practicing and conceptualizing the math they are learning in the classroom. PlayMath.org gives students the support of learning in a more visual way compared to a traditional classroom.  

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