In this interactive site students get to practice with various math skills in a real life scenario. Those skills include basic subtraction facts using materials, matching number sentences to pictorial representations, and writing number...

Second graders demonstrate comfort with addition, but show less ease with subtraction. Repeated practice with subtraction is necessary to build fluency.

Use multiplication, division, addition, or subtraction to play this math basketball game. Choose your operation and level to try to collect basketballs to use for shooting free throws. Each correct answer earns you one basketball - the...

[Free Registration/Login Required] This picture-perfect picnic is all set for some subtraction practice! Count up the jelly beans to find out how many got eaten. This picture problem is a great first step to helping your child understand...

Addition and Subtraction Math Theme provides an excellent collection of free sample worksheets, teacher resources, lesson plans and interactive media to support addition and subtraction skills.

This sample chapter from Hurst's book Picturing Math is an excellent resource for using picture books and activities for learning computation.

This site offers customizable math challenges to help students master their math facts. Options include skill, age, and difficulty level as well as number of problems.

Find here flashcards for addition, subtraction, multiplication, and division for printing off and coloring.

A brief lesson on subtracting from three-digit numbers that includes detailed examples, rules, and further explanation of borrowing.

Describes the characteristics of the bacteria Spirillum, its shape and size, habitat, growth, method of storing nutrients, and facts about different species.

Discover the difference between a fact or opinion. Look for signal or keywords for help.

The Canada Science and Technology Museum answers some of the most common questions about electricity. For example, get the definition of electricity, the difference between alternating and direct currents, and learn how a fuse works.

Sharpen your computation skills with two-digit addition, two-digit subtraction, and one-digit multiplication facts using this interactive worksheet. Learners must be familiar with multiplication facts through twelve to be successful....

[Free Registration/Login may be required to access all resource tools.] A brief explanation of the difference between facts, observation, and opinions. Includes a few questions to check for understanding.

Do you know the difference between a crocodile and an alligator? Find out how they differ, the number of species, what they eat, their characteristics and location. Six pictures show this reptile in its habitat.

Slideshow explains the difference between explicit and implicit meaning in texts and visuals. Includes good examples and practice questions.

Students will work as a class to solve word problems involving addition, subtraction, multiplication, and simple fractions. To culminate the instructional activity, students will create their own word problems.

Explains the difference between heat and temperature and provides facts about each.

Discover the difference between speed, velocity, and acceleration. Provides formulas and other interesting facts.

The purpose of this task is to help students develop flexible strategies for adding and subtracting within 20. Students will pick 5 number cards from pre-made cards labeled 1-10. Then, another student will pick a "target number" between...