# Differentiating Number Strings: The BandAid Problems

How do you plan a number string for a group of learners who are working on very different skills in … 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

# 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