Calling all math detectives! We’re celebrating the 100th day of school with a new Math Mystery every week from January 25 until February 28. Solve our riddles, think creatively, and start fun conversations all about problem solving and mathematical thinking.

## What is a Math Mystery?

A Math Mystery is a brain-teaser, video, or activity that invites students and parents to think about math together. Ask your child to be the detective and figure out how they want to approach and solve a problem. You’ll be amazed at the creative solutions they come up with! We’re combating math anxiety by making the problem-solving process part of the fun.

New Math Mysteries will go up every week on our Twitter and Facebook Page. But on-demand videos, lesson plans, and solutions can only be found here.

## Find a Math Mystery

- Mystery Math Mistake: 548+253Lesson 206
## Mystery Math Mistake: 548+253

Math3rd GradeJoin Mrs. Ignagni for a Mystery Math Mistake with T-Pops. See if you can be a detective and figure out what step T-Pops forgot in the traditional method!

- Mystery Math Mistake: 491-288Lesson 207
## Mystery Math Mistake: 491-288

Math3rd GradeJoin Mrs. Ignagni for a Mystery Math Mistake with her friend Springling. Can you figure out where she went wrong on her open number line?

- Mystery Math Mistake: 608-492Lesson 208
## Mystery Math Mistake: 608-492

Math3rd GradeJoin Mrs. Ignagni for a Mystery Math Mistake with her friend Springling. Can you figure out where she went wrong on her open number line?

- Mystery Math Mistake: 76+97Lesson 201
## Mystery Math Mistake: 76+97

Math3rd GradeJoin Mrs. Ignagni for a Mystery Math Mistake with D.C. Can you use your magnifying glass and find his mistake?

- Mystery Math Mistake: 99+97Lesson 202
## Mystery Math Mistake: 99+97

Math3rd GradeJoin Mrs. Ignagni for a Mystery Math Mistake with D.C. Can you use your magnified glass and find his mistake?

- Mystery Math Mistake: 143+256Lesson 203
## Mystery Math Mistake: 143+256

Math3rd GradeJoin Mrs. Ignagni for a Mystery Math Mistake with Value Pak. See if you can be a detective and figure out where the error is in the problem.

- Mystery Math Mistake: 245+362Lesson 204
## Mystery Math Mistake: 245+362

Math3rd GradeJoin Mrs. Ignagni for a Mystery Math Mistake with Value Pak. See if you can be a detective and figure out where the error is in the problem.

- Mystery Math Mistake: T-Pops' Missing StepLesson 205
## Mystery Math Mistake: T-Pops' Missing Step

Math3rd GradeJoin Mrs. Ignagni for a Mystery Math Mistake with T-Pops. See if you can be a detective and figure out what step T-Pops forgot in the traditional method!