How do you plan a number string for a group of learners who are working on very different skills in … More
Category: open number line
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
A count around for fractions
This February, I led a Number Strings Writers’ Retreat, as part of my role as staff developer at Math in … More
Video: Division on the open number line in fourth grade
Wondering what a number string looks like in a classroom? Curious about the details of the routine? The following video features … More
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
Beyond Skip Counting
This post comes to us from strings enthusiast and middle school teacher Marcelle Good, who works at School of the … More
Developing Algebra
This string was developed by our colleague Bill Jacob, University of California, Santa Barbara, who is, among other things, an … More
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
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
a series of sorting fractions number strings
Sorting Fractions, money, percentages or decimals Which would you rather have? 45/100 or ½ ¾ or 8/10 8/20 or 2/5 … More
Fractions as operators on money (Early fractions)
Fractions as operators, Money What is ½ of $1.00? What is 1/4 of $1.00? What is 2/4 of $1.00? What … More
Doubling with early fractions
Number String: Doubling 4 x 2 1/4 x 2 1/10 x 2 1/5 x 2 2/5 x 2 4/5 x … 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 