This color coded number chart is an effective visual tool to teach students the patterns of skip counting and number factors. Note that each factor 2-12 is a different color. The factors for each number are color coded in the dots above the number on the chart. Students can keep this number chart in their math folders as a handy tool. There are many ways to use the color coded number chart:
Skip Counting – Start with two and count the red numbers. Start with three and count the yellow numbers, etc. Look at the pattern of the colors.
Multiplication – For the problem 3 x 4, start with yellow and skip count four yellow dots. 3 – 6 – 9 – 12 3×4 =12
Prime numbers – Except for 3, 5 and 7, the prime numbers have zero colored circles, showing that it is only divisible by one and itself. This comes in handy when students are trying to reduce fractions. If the denominator is a prime number, it cannot be reduced.
Least Common Multiple – To Find the LCM of 3 and 4 look on the chart to find the lowest number that has both a yellow and green circle. LCM of 3 and 4 is 12.
Greatest Common Factor – To Find the GCF of 21 and 28 look above the numbers 21 and 28 to see what colors they both have. Check the color chart to find the largest common factor of the two numbers. GCF of 21 and 28 is 7 (purple)
Click here to download the color coded number chart. There is also a blank chart, so the students can color in the factors as they learn them. Have some white-out handy, as they might make some errors. 🙂