Properties of Matter
(100%)
Subject: Science
Topic: Matter Description: Matter is anything that has mass and takes up space. That is why mass and volume are the properties of matter. Find out about the different kinds of matter: conductors, insulators, and magnets. 

Energy & Matter
(99%)
Subject: Science
Topic: Matter Description: You can think of energy as the ability to move or cause change in matter. It comes in many forms. Kinetic energy is energy that is in use, and potential energy is energy that is stored for later. 

Subject: Science
Topic: Matter Description: Physical changes mean matter changes size or shape, not its atomic makeup. Chemical and nuclear changes alter matter on an atomic level. 

Subject: Science
Topic: Matter Description: All matter can exist in three forms: solid, liquid, or gas. Matter can change states through heating or cooling, and it is sure to change states when it reaches its boiling point or freezing point. 

The Carbon Cycle
(2%)
Subject: Science
Topic: Ecosystems Description: The carbon cycle describes how carbon passes from the air, to plants, to animals, and back to the air again 
Construct Angles
(2%)
Subject: Math
Topic: Geometry Description: Constructing angles is not that difficult once you learn how to use a protractor. A protractor is a tool that is specially designed to measure the degrees of an angle. 

The Kingdoms of Life
(2%)
Subject: Science
Topic: Plants Description: Scientists group organisms, or living things, with similar traits together. Kingdoms are the largest group, and there are five of them: plant, animal, fungus, protist, and bacteria. Grouping organisms into kingdoms helps scientists understand similarities among living things. 

The Kingdoms of Life
(2%)
Subject: Science
Topic: Animals Description: Scientists group organisms, or living things, with similar traits together. Kingdoms are the largest group, and there are five of them: plant, animal, fungus, protist, and bacteria. Grouping organisms into kingdoms helps scientists understand similarities among living things. 

Subject: Science
Topic: Matter Description: An atom is a tiny particle in matter, and atoms are made of protons, neutrons, and electrons. Some matter, like your body or your book, is made of lots of different kinds of atoms, but elements are made up of only one kind of atom. 

Heat
(2%)
Subject: Science
Topic: Energy, Light, and Sound Description: Heat is thermal energy that exists in matter. The faster an object’s particles move, the more heat it has. Heat can be added to an object by making its particles speed up. 

Aquatic Ecosystems
(1%)
Subject: Science
Topic: Ecosystems Description: There are two main types of aquatic ecosystems: freshwater and saltwater. The main difference between these two ecosystems is, you guessed it, saltiness. Oceans, rivers, swamps, bogs, and streams are all aquatic ecosystems. 

The Nitrogen Cycle
(1%)
Subject: Science
Topic: Ecosystems Description: Nitrogen is important to living things because plants and animals use it to make protein, which allows them to live and grow. The nitrogen cycle describes how nitrogen is continuously transformed between organic and nonorganic forms. 

Subject: Science
Topic: Force and Motion Description: Acceleration is a change in velocity. That means acceleration can mean a change in speed or direction. Acceleration can be thought of as an object’s change in velocity over time. 

Multiplication
(1%)
Subject: Math
Topic: Multiplication and Division Description: Multiplication is the repeated addition of equal groups. The number of equal groups and the number in each group are your factors. Once you know those factors, just apply these four properties of multiplication. 

Fractions
(1%)
Subject: Math
Topic: Fractions Description: Fractions represent part of a whole number. When you spend fifty cents, you have half of a dollar left. Or when you complete the first five of your ten math problems, half of your homework is complete! Fractions help show how a whole is divided up. 

Measure Angles
(1%)
Subject: Math
Topic: Geometry Description: An angle is formed by two lines that start at the same point, and a protractor is the tool you use to measure it. Use vertices and rays as your guides, and you will be measuring angles like a master. 

Subject: Math
Topic: Addition and Subtraction Description: Addition properties are rules that you can follow when adding numbers. The commutative property, associative property, and identity, or zero, property are the rules. They can make adding as simple as singing a song. 

Combinations
(1%)
Subject: Math
Topic: Probability Description: Combinations pop up in ordinary life all the time. When you need to find out all the possible combinations of something, an organized list is the way to go. 

Food Chains
(1%)
Subject: Science
Topic: Ecosystems Description: A food chain is made up of three groups Ö producers, consumers, and decomposers Ö who interact with each other in an ecosystem to get the energy they need. 

Equivalent Fractions
(1%)
Subject: Math
Topic: Fractions Description: An equivalent fraction is a fraction that looks different, but has the same value or represents the same part of a whole as another fraction. Learn how make and find equivalent fractions. 

Subject: Math
Topic: Addition and Subtraction Description: Sometimes when you add, you have to regroup, or carry, a group of tens, and that is why you have to line up your problem like a pro. 

Divisibility Rules
(1%)
Subject: Math
Topic: Multiplication and Division Description: Divisibility rules can help you easily identify which numbers are divisible by other numbers. That is especially helpful when you have to divide a big number. Memorize these rules, and you will be a dividing dynamo! 

Tell Time
(1%)
Subject: Math
Topic: Measurement Description: There’s a lot to keep track of when you’re telling time: the short hand the long hand, not to mention all those pesky phrases. 