Teach the croc bigger and smaller
A Math learning game for primary school, Grade 1 to Grade 6
Hungry Croc is a number-comparison game for primary school, grade 1 through grade 6. Expressions like "45 > 23" appear on the screen, and the child feeds the correct expressions to the crocodile's mouth.
The Android app is on Cafe Bazaar and Myket, Iran's app stores. Anywhere else, play the online version in any browser.
Hungry Croc is part of the Nikipoo School app, alongside 85 other games. The game is in Persian.
Comparing two numbers looks simple, but place value, fractions and decimals hide behind it. In Hungry Croc, ten expressions like "45 > 23" float on a pond, and the child drags the correct ones with a finger into the crocodile's mouth. In grade 1 the comparison covers up to fifty and the tens; in grade 2 and 3, close three- and four-digit numbers; in grade 4, fractions with equal denominators and unit fractions; in grade 5, closely spaced decimals; and in grade 6, positive and negative numbers.
Here the child doesn't produce an answer — they judge whether a complete math statement is true. They must read the greater-than or less-than sign, weigh both sides, and decide. This checking skill is exactly what they'll later need to review their own answers on a test.
When two four-digit numbers like close-together nine-thousands sit side by side, the child learns to start comparing from the thousands place, not from whichever digit looks bigger at a glance. This orderly, step-by-step look cements place value in practice.
A child naturally thinks four is bigger than three, so a quarter should be bigger than a third too. Levels like "the bigger the denominator..." and negative numbers challenge that assumption. Calmly facing such a contradiction is one of the most effective ways to correct a misconception.
Dragging a bubble to the crocodile's mouth, unlike a quick tap, gives a few moments to think. If the expression is wrong, the crocodile won't eat it, an encouraging message appears, and the bubble stays on the pond. The child learns to pause briefly before acting — good practice for impulse control.
A tip for parentsPut two price tags or two house numbers side by side and ask which is bigger and why. For fractions, cut one loaf into three pieces and another into four, so the child sees with their own eyes that a bigger denominator means a smaller piece.
Level titles are listed in the order the child plays them — from easy to hard, following the school textbook.
Grade 134 levels
Grade 234 levels
Grade 333 levels
Grade 433 levels
Grade 533 levels
Grade 633 levels
Number Diver
Hunt numbers in the ocean depths
Math Bubbles
Pop the bubble with the right answer!
Quick & Sharp
Calculate fast, tap sharp — friends of ten, times tables and percent
Daily 10: Math
Ten mental-math questions every day, matched to your child's grade
Number Train
Arrange numbers smallest to largest, or the other way
Rescue Helicopter
Find the number, rescue it!
Number Pairs
Find the matching number pairs
Number Riddles
Four-choice number riddles
Open Nikipoo School — Hungry Croc and 85 other games are waiting for you.
The Android app is on Cafe Bazaar and Myket, Iran's app stores. Anywhere else, play the online version in any browser.
Nikipoo School
