Flats, Rods, & Units Worksheet/Game

Flats, Rods, & Units Worksheet/Game
Welcome to Flats, Rods, & Units Worksheet/Game. This game is designed to help students visualize place value by predicting how a large pile of “ones” can be grouped into “tens” and “hundreds.” Scroll down the page for a more detailed explanation.

 

 

How to play the Flats, Rods, & Units Worksheet/Game

1. Choose Your Level
   When you open the game, you’ll see two options:
   Rods & Units: Focuses on numbers up to 99. You will deal with Tens and Ones.
   Flats, Rods & Units: Focuses on larger numbers (up to 500). You will deal with Hundreds, Tens, and Ones.
   

2. The Problem
   A random number of small blue squares (units) will appear on the screen. The game will ask:
   “If you have [X] units…"
   

3. Prediction
   Your goal is look at the total number and break it down into the input boxes:
   Flats: How many groups of 100 can you make? (Look at the hundreds digit).
   Rods: How many groups of 10 are left? (Look at the tens digit).
   Leftovers: How many single units remain? (Look at the ones digit).
   

4. Check & Watch the Exchange
   Click “Check Exchange.” If you are correct, the game plays a happy chime and starts the animation:
   The messy units will vanish.
   They will be replaced by neatly organized Flats (large squares), Rods (tall bars), and single Units.
   This shows you exactly how your number is “built."
   

💡 Tips for Teachers/Parents
The Digit Trick: Teach the player that for a number like 342, the digits themselves are the answer: 3 flats, 4 rods, and 2 ones.
Zero is a Number: If the number is 205, remind them that there are 0 rods. They should type “0” in the Rods box.

Tens and Ones

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