Math Puzzler: Triangle Sums

Because you're not signed in, this is a just brief preview of the video.

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.

  1. Using the digits 1-9, and four blanks per side, students try to sum up each side of a triangle to equal 17.
  2. 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.
  3. 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.
  4. We discuss the pattern between the sum of all numbers and the sum of the smallest sides.

Related CCSS Math Standards:

What teachers are saying

"We use Byrdseed.TV when we do staff development to motivate and give fresh ideas to teachers working with gifted and advanced students." ~ Debbie in Oregon

"I am the coordinator for our district GATE program. Byrdseed.TV is one of my favorite sites and one of the best investments I have made for the program." ~ Jeannette in California

"The ideas presented are clear and straight-forward and my students have responded positively to every lesson idea I’ve used from Mr. Byrd and his colleagues. It’s my favorite go-to resource for gifted students." ~ Melissa in North Carolina

Watch More

Part 1 of Advanced Math Explorations