youcubed: Prime Time
Here’s a game where students can color patterns in a hundred chart showing multiples of a number they have rolled.

Task Instructions

  • Player 1 and player 2 each pick a different colored high lighter.
  • Player 1 rolls the dice and adds the two numbers. Player 1 then colors in every multiple of that number on the hundred chart. If a player rolls and gets the sum of 2 they color all of the prime numbers.
  • Player 2 rolls the die and colors every multiple of that number on the hundred chart.
  • If a number is already colored the player skips that number and continues coloring any available multiple of their number to 100.
  • If a player rolls and there are no multiples available for their number they lose their turn.
  • When the hundred chart is completely colored, each player should count the number of squares they have high lighted.
  • The player with the greatest number of colored squares wins the game.


  • On your turn, skip count the squares you color by the number you rolled. For example, you roll a three so you count 3, 6, 9, etc.
  • Record your final count as your score at the end of your turn.
  • At the end of the game each player finds their score by finding the sum of their scores.
  • The player with the highest score wins.


  • Two dice
  • One hundred’s chart
  • Two different colored high lighters

Addition & Subtraction, Multiplication & Division
K-6, Middle School

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youcubed (Stanford University)

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