Hundred Chart of Multiples and Factors
The hundred chart of multiples and factors is an effective visual tool to teach students the patterns of skip counting and number factors. Each factor from 2-10 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 hundred chart in their math folders as a handy tool. You may click on the image to download the colored chart and also a blank chart, so students can color in the multiples. Here are many ways to use this hundred 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 no colored circles, showing that it is only divisible by one and itself.
Reduce Fractions – To see if you can reduce the fraction 9/15 look at the numerator and denominator in the number chart and see that they have a common factor of 3. Divide each number by 3 to reduce the fraction to 3/5.
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)