3 Act Tasks

Problem solving lessons that
spark a conversation

Clothesline Math

Interactive number
lines for K-6

Clothesline Math Club

See more ideas about
clothesline activities

Number Talk Images

Finding math in every
day places

Now Available For Purchase - Hanging Math Out To Dry With Elementary Clothesline Math

By Kristen Acosta

Making sense of math one card at a time

If you would like to purchase books using a purchase order, please email Kristen at thekristenacosta@gmail.com.

Upcoming Conference

Conference of Advancement of Mathematics Teaching, Dallas-Fort Worth , TX ( June 26 - June 28 )

Latest Blog Posts

Testing is over….now what?

It’s that time of the year when the ugly monster called “CAASPP” comes lurking about. (That’s the test we take here in California). Teachers are fretting that they may not have covered as many standards as they had wanted. Meanwhile, it’s spring time for students. They are antsy, edgy, and see that summer is around the corner……….or maybe I’m describing ...

An Ode to Math TShirts

An unusual occurrence happened during my session at the Virtual Math Summit (held by Build Math Minds). During my pre-recorded session, many participants were noticing my math shirts. They all wanted to know where they can get some of my math shirts. I’ve been collecting math shirts for my whole career. I don’t just collect any math shirt. They ...

Discovering Humanity through Math with Francis Su

During the winter break, I like to catch up with all the good stuff that I didn’t have the time for during my teaching life. I finally had the chance to sit down and listen to a podcast that included Francis Su, a professor of math and writer (His book Mathematics for Human Flourishing is on my bookshelf waiting for me ...