An extensive index containing links to many sites describing radiation measuring instruments. A comprehensive website on the topic.

Students will practice composing and decomposing numbers with this quick game. Show the student 6 counters. Ask the student to close his/her eyes. Hide some of the counters under a sheet of heavy paper. When the student opens his/her...

This lesson plan will have students arranging patterns with counters. Students will copy the pattern introduced in Stuart Murphy's Beep, Beep, Vroom, Vroom. Then students will create their own patterns with counters. Pupils will...

Students will count counters, draw a picture of the counters, and record the number in a booklet. A list of materials and how to put together the booklet is included. This activity is most effective if initially it is done daily with all...

The following lesson will serve as a hands-on math activity reviewing the 2's and 3's multiplication and division factors. Students will examine the relationship between multiplication and division using Starburst and Jolly Rancher candy...

[Free Registration/Login Required] A collection of teacher created activities that focus on basic addition practice. Includes frog counters that can be printed and laminated, a dot-to-dot activity, and ready-to-use math worksheets that...

Play a game with counters to explore subtraction hands on.

The purpose of this task is for students to decompose a number as a sum of two other numbers in more than one way. Students will shake and spill 5 two colored counters and determine how many of each color is showing and record the sum...

Students will learn that there are multiple ways to solve math problems, such as drawing a picture, using counters, using fingers, using a number line, and memorizing facts. The teacher writes a simple addition problem on the whiteboard...

The purpose of this task is for students to find different pairs of numbers that sum to 4. Students will solve an everyday problem in their head and then model their solution using counters. They can represent their solutions using...

This is a good small group/pairs activity to practice counting. Each student grabs two handfuls of counters and counts them. The student then draws and records the quantity on a student-recording sheet (example included). Student...

Students will play this Bingo by covering numbers that "come after" the number shown. Students will take turns drawing a number card, stating the number after and placing his/her counter on that number on the game board. The first...

Students will complete an activity to practice addition using counters and dice.

Students are given a word problem, red and yellow counters, and a tenframe to solve the problem.

This lesson provides middle schoolers with a real-life application of problem solving. Students will use color counters to model writing expressions and equations. They are given a scenario to follow where clues about the content of bags...

Explains what a Geiger counter is, how it is constructed, and how it works.

An image of a Geiger Counter and definitions of the types of rays a counter can detect, alpha, beta and gamma. Includes inventor and date of invention. Continue on "Next," page for even more info.

Historian Gary Sheffield recounts the events, strategies, and outcomes of the Battle for the Atlantic, in a six-part illustrated article.

[Free Registration/Login Required] This flipchart mimics the use of counters to teach addition of integers with like signs and integers with different signs. There are definitions hidden at the bottom of some pages, just grab and drag to...

Push your problem-solving skills to the limit. Arrange 3 red, 3 blue and 3 yellow counters into a three-by-three square grid, so that there is only one of each color in every row and every column.

Number Frames help students structure numbers to five, ten, twenty, and one hundred. Practice counting using these interactive number frames. Tap a frame to add it to your workspace, or design your own frame, then drag and drop counters...

Site from NASA explaining the construction and use of a Geiger counter. The site has links to many related topics, such as plasma, ions, and electrons.

Contains some pictures and a brief description of how a Geiger Counter functions.

This article, by a engineer and physicist, features graphs made with a Geiger counter in order to measure the Radon levels in his house.