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PhET: Number Compare
Compare numbers represented as numerals, objects, groups, and ten frames. Use a sentence, number line, or stacked units to determine the larger group. Hear the comparison spoken aloud in two different languages.

Ways To Make A Number Using Addition
Improve your math knowledge with free questions in "Ways to make a number using addition" and thousands of other math skills.


Credit Reports
Improve your math knowledge with free questions in "Credit reports" and thousands of other math skills.

Identify Lines Of Symmetry
Improve your math knowledge with free questions in "Identify lines of symmetry" and thousands of other math skills.

Name Polygons: Up To 6 Sides
Improve your math knowledge with free questions in "Name polygons: up to 6 sides" and thousands of other math skills.

Regroup Thousands, Hundreds, Tens, And Ones - Ways To Make A Number
Improve your math knowledge with free questions in "Regroup thousands, hundreds, tens, and ones - ways to make a number" and thousands of other math skills.

Model Decimals And Fractions
Improve your math knowledge with free questions in "Model decimals and fractions" and thousands of other math skills.

Divide 4-digit Numbers By 2-digit Numbers: Word Problems
Improve your math knowledge with free questions in "Divide 4-digit numbers by 2-digit numbers: word problems" and thousands of other math skills.

Sort Addition Facts - Sums To 20
Improve your math knowledge with free questions in "Sort addition facts - sums to 20" and thousands of other math skills.

Put Decimal Numbers In Order Ii
Improve your math knowledge with free questions in "Put decimal numbers in order II" and thousands of other math skills.

Decimal Multiplication: Compare Products Up To Hundredths
Improve your math knowledge with free questions in "Decimal multiplication: compare products up to hundredths" and thousands of other math skills.

One-step Inequalities: Word Problems
Improve your math knowledge with free questions in "One-step inequalities: word problems" and thousands of other math skills.

Prime And Composite Numbers
Improve your math knowledge with free questions in "Prime and composite numbers" and thousands of other math skills.

Subtract Fractions With Like Denominators Using Number Lines
Improve your math knowledge with free questions in "Subtract fractions with like denominators using number lines" and thousands of other math skills.

Multiply 1-digit Numbers By 3-digit Or 4-digit Numbers: Choose The Area Model
Improve your math knowledge with free questions in "Multiply 1-digit numbers by 3-digit or 4-digit numbers: choose the area model" and thousands of other math skills.

Complete The Subtraction Sentence - Up To 20
Improve your math knowledge with free questions in "Complete the subtraction sentence - up to 20" and thousands of other math skills.

Euclid s Puzzling Parallel Postulate Jeff Dekofsky
Euclid, known as the "Father of Geometry," developed several of modern geometry's most enduring theorems--but what can we make of his mysterious fifth postulate, the parallel postulate? Jeff Dekofsky shows us how mathematical minds have put the postulate to the test and led to larger questions of how we understand mathematical principles.

Interpret Graphs Of Proportional Relationships
Improve your math knowledge with free questions in "Interpret graphs of proportional relationships" and thousands of other math skills.

Add Three Numbers Up To Four Digits Each
Improve your math knowledge with free questions in "Add three numbers up to four digits each" and thousands of other math skills.

Interpret Bar Graphs: Multi-digit Numbers
Improve your math knowledge with free questions in "Interpret bar graphs: multi-digit numbers" and thousands of other math skills.

TED-Ed: Problem Solving Lessons
TED-Ed celebrates the ideas of teachers and students around the world. Discover hundreds of animated lessons, create customized lessons, and share your big ideas.