This worksheet has students practicing the use of two arithmetic formulas. Students will need to know the formula to find a specific term in an arithmetic sequence: an = a1 + (n – 1)d and the formula to find the sum of a sequence: Sn = n(a1 + an)/2. By finding the sum for each series students will be able to match colors with the correct number for the coloring sheet. Students of all ages love to color! Even my high school students want to work through the math, so they can color.