This short video and interactive assessment activity is designed to teach fourth graders about adding decimals - word problems.

In this activity, students construct adding slide rules, scaled with linear calibrations like ordinary rulers. Students learn to move these scales relative to each other in ways that add and subtract distances, thus calculating sums and differences. This is Activity A1 in the "Far Out Math" educator's guide. Lessons within the guide include activities in which students measure, compare quantities as orders of magnitude, use scientific notation, and develop an understanding of exponents and logarithms using examples from NASA's GLAST mission. These are skills needed to understand the very large and very small quantities characteristic of astronomical observations. Note: In 2008, the GLAST mission was renamed Fermi, for the physicist Enrico Fermi.

This short video and interactive assessment activity is designed to teach fourth graders about adding, subtracting, multiplying and dividing.

This short video and interactive assessment activity is designed to teach fourth graders about adding, subtracting, and multiplying with parentheses.

This short video and interactive assessment activity is designed to teach fourth graders about adding unit lengths in one step (english units).

This short video and interactive assessment activity is designed to teach second graders about adding unit lengths in one step (english units).

This short video and interactive assessment activity is designed to teach fourth graders about adding and subtracting.

This short video and interactive assessment activity is designed to teach fourth graders about adding and subtracting money with pictures in columns.

This is an interactive assessment and video designed to teach Adding and Subtracting (Numbers up to 20) - Word Problems to first graders.

This short video and interactive assessment activity is designed to teach fourth graders about adding and subtracting terms (numbers to 100).

This short video and interactive assessment activity is designed to teach fourth graders about addition: completing the addition sentence.

The purpose of this task is to study some patterns in a small addition table. Each pattern identified persists for a larger table and if more time is available for this activity students should be encouraged to explore these patterns in larger tables.

This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important aspects of the task and its potential use.

Students place markers on the numbers 2-12. Students toss two 6-sided dice, find the sum and remove a marker from that number, if there is still one. The first player to remove all markers wins the game. This game can be used as addition practice or as an introduction to the probability of the different outcomes of rolling two dice. This game was developed by a Monmouth University student for the Probability Fair. These games help students acquire proficiency in addition and subtraction facts.

This short video and interactive assessment activity is designed to teach third graders about one step addition and subtraction - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about one step metric capacity with addition and subtraction - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about addition of capacities - word problems.

This short video and interactive assessment activity is designed to teach third graders about addition of sequential capacities - word problems.