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Math for Kids23 chapters | 325 lessons

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Instructor:
*Cori Hodges*

Cori has degrees in Elementary Education and Early Childhood Education and has taught lower elementary.

This lesson contains some of the words that are often used in 4th grade math lessons. These are words that you will continue to use through future math lessons in future years

Below, you will find several words that are important to know as you begin 4th grade math. Each word is followed by a simple definition to help you better understand the word and how it will be used.

**Second**: A second is a unit used to measure time. There are 60 seconds in one minute.

**Minute**: A minute is a unit used to measure time. A minute is made up of 60 seconds, and there are 60 minutes in one hour.

**Hour**: An hour is a unit used to measure time. There are 60 minutes in one hour and 24 hours in one day.

**Diameter**: The diameter of an object is the distance from one edge to the opposing edge, when measured through the middle of the object.

**Area**: Area is the amount of space a two-dimensional (flat) figure takes up. To find area, you multiply height by width.

**Circumference**: Circumference is the distance around an object, such as a circle or oval.

**Perpendicular**: A perpendicular line is a straight line that runs at a 90-degree angle to another line.

**Parallel**: Parallel lines are lines that run side by side and never cross paths.

**Line Segment**: A line segment is a portion of a line that is contained between two definite end points. It can also be a line that connects two points.

**Factor**: Factors are the numbers that you multiply together in a multiplication problem. For example, in 4 x 6, the factors are 4 and 6.

**Product**: When you multiply two or more numbers, the answer is called the product. For example, in 4 x 6 = 24, the answer 24 is the product.

**Multiples**: A multiple is a number that could be the result of multiplying any number by another. For instance, 6 is a multiple of 3, because if you multiplied 3 by 2, you would get 6. Similarly, 2, 4, 6, 8, 10, 12 and 14 are all multiples of the number 2.

**Variable**: A variable is the symbol for an unknown number. It is usually a letter of the alphabet, like *x* or *a*.

**Consecutive**: When we say that numbers are 'consecutive,' we mean that they go in order. There are no gaps or missing parts.

**Percent**: A percent is a part of one hundred. For example, if there are one hundred fish, and twenty five are red, then 25% of the fish are red.

**Mixed Number**: A mixed number is a number that consists of a whole number and a fraction.

**Ordinal numbers**: An ordinal number is a number that tells the order items are in. First, second, third, fourth and so on are ordinal numbers.

**Probability**: Probability is the chance that something will happen, usually measured as a ratio.

In this lesson, we explored important words you'll need to know for 4th grade math. These words focus on telling time, measurement, lines and multiplication, and they will prove helpful throughout your education and in everday life.

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Math for Kids23 chapters | 325 lessons

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