This post is from Raquel Goya, a Kindergarten teacher at Hoover Elementary in Palo Alto, CA. Raquel noted that, “Although … More

# Author: Kara Imm

# New percentage number strings

We recently saw the problem above on a New York CCSS-M 6th grade benchmark test. A few teachers I was … More

# “Stack of Bills” string

Here’s a string I designed with a team of fifth grade teachers who were looking for creative ways to encourage … More

# Fractions as Operators (Dot Arrays)

Here’s a collection of strings written by teacher participants at the Summer Institute at Math in the City (City College, … More

# From additive to multiplicative thinking

A few weeks ago our colleague and collaborator Pam Weber Harris led a really interesting numeracy workshop at Math in … More

# Challenge problems, helper problems

When designing strings, there are typically one or more helper problems before a challenge problem. For example, you might start … More

# Arrays on the West Side

We recently learned that the third grade team at Manhattan School for Children (Elizabeth Frankel-Rivera, Madelene Geswaldo, Alice Hsu and … More

# How to extend a string

We are often asked about how we can “stretch” strings beyond their place as a short mental math activity in … More

# Making Thinking Visible

I recently worked with a 6th grade teacher, Miss T, as she led a string for the very first time. … More

# New strings for Measurement + Unit Conversion

Our 5th grade team was trying to address several challenges with implementing Common Core 5th grade standards of multiplying and … More

# A Dilemma with Models

A 5th grade teaching team I work with recently raised the issue of how to model the problem 1/2 x … More