1. Be explicit at the start that getting more voices, more ideas into our conversation is our goal, because we … More
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Prime Climb Number String
Last month, I worked in Andrew Eller’s amazing 4th grade classroom in Los Angeles that was beginning an exploration of … More
Biking on the fractional number line . . .
The following post comes from Rafael Quintanilla, a Mathematics Instructional Coach for the Los Angeles Unified School District and a … More
Number string structure and design
How are number strings designed? Typically, people tend to describe number strings as having the following structure Entry problem Helper … More
What is the difference between Number Strings and Number Talks?
What’s the difference between a Number String and a Number Talk?
Complications with representing constant difference on an open number line
Representing student thinking during a number string is complex. Certain strategies are particularly challenging to represent. For addition and subtraction, … 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
The “King of Strings” teaches us that strings are maatwerk
I recently reached out to Willem Uittenbogaard. Willem was one of the original collaborators between Math in the City (founded by … More
Subtraction string – where is the answer?
My name is Jennifer DiBrienza. I taught elementary school in New York City public schools for 9 years and began … 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
Halving with early fractions
Minilesson: Halving (Rachel Lambert) What is ½ of 1? What is ½ of ½? What is ½ of 1/4? What … More
Number Strings 