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PhET: Vector Addition
Explore vectors in 1D or 2D, and discover how vectors add together. Specify vectors in Cartesian or polar coordinates, and see the magnitude, angle, and components of each vector. Experiment with vector equations and compare vector sums and differences.

Identify Independent And Dependent Variables: Word Problems
Improve your math knowledge with free questions in "Identify independent and dependent variables: word problems" and thousands of other math skills.


Shape Patterns
Improve your math knowledge with free questions in "Shape patterns" and thousands of other math skills.

PhET: Area Model Algebra
Build rectangles of various sizes and relate multiplication to area. Discover new strategies for multiplying algebraic expressions. Use the game screen to test your multiplication and factoring skills!

Build Cube Trains To Add Up To 10 - Words
Improve your math knowledge with free questions in "Build cube trains to add up to 10 - words" and thousands of other math skills.

Balance Addition And Subtraction Equations - Up To 20
Improve your math knowledge with free questions in "Balance addition and subtraction equations - up to 20" and thousands of other math skills.

Convert And Compare Metric Units
Improve your math knowledge with free questions in "Convert and compare metric units" and thousands of other math skills.

Use Equations To Solve Multi-step Addition And Subtraction Word Problems
Improve your math knowledge with free questions in "Use equations to solve multi-step addition and subtraction word problems" and thousands of other math skills.

Find Equivalent Fractions Using Fraction Strips
Improve your math knowledge with free questions in "Find equivalent fractions using fraction strips" and thousands of other math skills.

Identify Equivalent Expressions I
Improve your math knowledge with free questions in "Identify equivalent expressions I" and thousands of other math skills.

Addition Word Problems - Four Or More One-digit Numbers
Improve your math knowledge with free questions in "Addition word problems - four or more one-digit numbers" and thousands of other math skills.

Benchmark Percents With Strip Models: Multiples Of 10, 20, 25, And 50 Percent
Improve your math knowledge with free questions in "Benchmark percents with strip models: multiples of 10, 20, 25, and 50 percent" and thousands of other math skills.

Multiplication Input/output Tables
Improve your math knowledge with free questions in "Multiplication input/output tables" and thousands of other math skills.

Use Strip Diagrams To Represent And Solve Multi-step Word Problems
Improve your math knowledge with free questions in "Use strip diagrams to represent and solve multi-step word problems" and thousands of other math skills.


Compare Numbers Using Multiplication: Word Problems
Improve your math knowledge with free questions in "Compare numbers using multiplication: word problems" and thousands of other math skills.

Complete Addition And Subtraction Sentences With Fractions
Improve your math knowledge with free questions in "Complete addition and subtraction sentences with fractions" and thousands of other math skills.