![]() ![]() We took a purple crayon and outlined the box around number 5, and continued on to color every 5th number not already colored in. Outline the box around number 3, and then fill in every third box that is not already filled in.Ĥ. We then look over the entire chart and color In the other numbers that divide by 2 (all multiples of 2).ģ. ![]() ![]() Next, we took the a greenish crayon and outlined the box around number 2. Not only is 1 an odd number, but we also eliminate him first from our prime number chart. There are numerous hundreds charts to choose from on the web, but all you need is a simple one. All numbers on the hundreds chart NOT colored in are the prime numbers.įirst, print out a hundreds chart. When we get done with this activity, many of the numbers on the hundreds chart will be colored in. I don't know if Eratostheses was a "kid guy", but he might have been-This method is really fun for kids!Īll you need is a hundreds chart and colored pencils or crayons. Thankfully for us, Greek mathematician Eratosthenes was really smart and created a handy system for finding all the prime numbers, over a limited range. I wanted to give her a good visual picture of what prime numbers are. My daughter is learning what prime numbers are in her math curriculum. A prime numbers are numbers greater than one that cannot be divided by any other number except themselves and one. ![]()
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