# Math Puzzler: Triangle Sums

This contains **4 videos for students** to work through independently. Learn more about student access here.

From Prufrock Press’ Advanced Common Core Math Exploration series, we introduce the Triangle Sums exploration.

- Using the digits 1-9, and four blanks per side, students try to sum up each side of a triangle to equal 17.
- We break down the importance of the corner spots, then students use 1-12 and five blanks per side to sum up to the smallest sides possible.
- We reveal the solution, then students try to predict the smallest sides of a triangle with only 3 blanks per side, then 6 and 7.
- We discuss the pattern between the sum of all numbers and the sum of the smallest sides.