Something that’s made up of exactly similar parts facing each other or around an axis

**Example:** A square is a symmetrical shape because each side is the same as its opposite side.

To have enough money or resources to buy or do something

A rocky object in our solar system that orbits the sun. A ring of these space rocks, called the asteroid belt, lies between the rocky planets and the gas giants.

A number that stands for part of a whole quantity. Fractions are made up of two numbers—a numerator and a denominator—divided by a horizontal line.

**Example:** If one apple is cut into four equal slices, and you eat one slice, you have eaten 1/4 of the apple

Fractions that are commonly used to judge the size of other fractions.

**Example:** 1/2

To replace a number with an approximately equal but simpler number. Numbers can be rounded up (if the digit to the right of the place value you're rounding to is 5 or greater) or rounded down.

**Example:** 25 rounded to the nearest ten is 30

The process of cutting down trees and transporting the wood

A careful and thorough study of the land or water in a geographic region

Went somewhere with someone

The state of being held or confined, such as having wild animals live in zoos

Unsteady, dizzy, or dazed

Simple machines that have a grooved wheel around which a rope or chain can run. Pulleys are used to lift heavy loads more easily.

Facts or information used to make or calculate a value

Numbers that contain a decimal point. The decimal portion of a number consists of the place values to the right of the decimal point.

**Example:** 2.5

A part or section of something

Events that happen to someone

A sample, or an example used to stand for a whole group. Scientists often collect specimens to study in a lab.

Feeling severe pain or suffering

Causing harm; having the effect of poison

Mathematical diagrams that can be used to set up and solve problems, such as an array or area model

**Example:** To solve 2 x 7, you might draw an array that has 2 rows of objects with 7 objects in each group. Your total is the total number of objects, or 14.

Numbers that divide equally into another number are called factors of the other number; a number is always a factor of itself. In a multiplication problem, 2 or more factors are multiplied together to find a product.

**Example:** In the equation 3 x 5 = 15, 3 and 5 are factors

A mathematical phrase that can include numbers, symbols, and/or operators

**Example:** 6 – 7

A creature from Egyptian mythology with the body of a lion and the head of a man, ram, or hawk. Sphinxes are often seen in large statues.

Levels of some material placed over or under other levels

A mathematical drawing or plan that explains something, such as a shape

**Example:** A diagram of a rectangular prism could be used to calculate its volume

An interruption in a broadcast or an electronic signal so that you cannot see or hear the program or the message properly. For example, interference can make a radio broadcast sound like static noise.

A calculation that is not exact. Estimates are often used when making calculations quickly, with large numbers, or decimal numbers.

**Example:** To estimate 19.8 x 3, you can round the expression to 20 x 3. This means your estimate is 60