Boxes and cartons of pencils are a natural, real-world example for understanding bundles of ten and their relationship to a hundred. When you have many cartons, you can discuss place value, and how to represent multiple hundreds.  

First graders work together to sort, categorize, and order collections of objects through activities that help build number sense. 

Young mathematicians construct their own understanding of integers with an inquiry-based math lesson. Using colored chips to represent positive and negative numbers, children model a series of addition and subtraction problems as...

Support young mathematicians' interpretation of place value in order to multiply single-digit numbers by 10. The task builds upon and enhances a learners' understanding of place value, a second grade skill, while introducing...

Working with base 10 blocks? Use this base 10 mat to organize blocks, tens and ones with one ten frame, and determine how many groups of blocks can be used to represent numbers.  

When working with base blocks, you need a base ten mat. Well, here it is! Organize your tens and ones using this mat to represent, count, and examine numbers. 

Here is a pdf file containing a Gattegno grid and ideas relating to its use. Try it out for place value, addition, and counting practice.

Here is a great learning task that focuses on the development of areas in computational fluency including strategies in mental math. Young learners are guided through a list of addition expressions that help them visually understand the...

Mathematicians need to know that not all numbers are rational. We approximate irrational number with rational numbers. That is why a calculator may be misleading. This task give learners an opportunity to see how rounding a number and...

What is the meaning of sea level? This resource helps your class understand the meaning of elevations above, below, and at sea level. Provides for good discussion on using positive and negative numbers to represent quantities in the real...

After examining a short article on fractions and decimals, readers draw information for the text to respond to a series of reading comprehension questions.