Discovery Channel's Cosmeo

SIGN UP OR SIGN IN
You will be able to view WebMath solvers once you are a member.

Elementary Math

Add, subtract, multiply and divide.

Natural Whole and Integers	Use this page to classify a number as a natural number, a whole number, and/or an integer.
Ordinal vs. Cardinal Numbers	Cardinal numbers are counting numbers (one, two, three,…) and ordinal numbers indicate the position of things in a set (first, second, third,…). Answer the questions on this page to see the difference between ordinal and cardinal numbers.
Percentages	A fraction can be represented visually as a percent of a set. This page will show you how.
Rational and Irrational Numbers	All numbers that can be expressed as fractions are rational numbers and all other numbers are irrational numbers. Answer the questions on this page to identify numbers as rational or irrational.
Skip Counting	Skip counting is used to practice addition and it also introduces multiplication. This page will teach you how to skip count.
Square and Cube Roots	Do you need help with finding the square root or cube root of a number? This page can help.
Addition	This selection will show you how to add two numbers together. Type your numbers into the boxes below, then click "Add them!” Try some really large numbers if you like!
Subtraction	This selection will show you how to subtract two numbers. Type your numbers into the boxes below, then click "Subtract them!" Try some really large numbers if you like!
Multiplication	This selection will show you how to multiply two numbers together. Type your numbers into the boxes below, then click "Multiply them!”
Division	This page will show you complete “long division” solutions for the division of two numbers. Fill in the division problem with your numbers, then click "Divide."
Create Practice Problems with Answers	Work some practice math problems. Fill in the boxes below then click "Go!" to give yourself a little extra practice.
Create Practice Problems without Answers	Work some practice math problems. If you want to become better at working math problems, you have to practice working math problems! Fill in the boxes below then click "Go!" to give yourself a little extra practice.
Number Lines	This selection will show you where a number belongs on the number line. Type your number below then click "Show me!" You will actually be shown how to add two numbers together, step-by-step, the "long hand" way. This selection can be sort of fun too, because it can show you how to add together very, very large numbers that can have up to 30 digits each! Type in your numbers into the boxes below, then click "Add them!". Try some really large numbers if you like!
Number Lines Comparisons	This selection will show how to compare two numbers using a number line. This will allow you to tell if a number is larger or smaller than another number, using a number line. To compare two numbers, type one number into each of the boxes below, then click "Show me." another number, using a number line. To compare two numbers, type one number into each of the boxes below, then click "Show me."
Making Combinations	See How Many Permutations You Can Make. Enter your objects (or the names of them), one per line in the box below, then click "Show me!" to see how many ways they can be arranged, and what those arrangements are. Note Note: 8 items have a total of 40,320 different permutations. For the sake of output and server capacity, we cant let you enter more than 8 items!
Scientific Notation: Multiplication	Multiply Two Numbers in Scientific Notation This page will show you how to multiply two numbers. One (or both) of your numbers might be in scientific notation. Fill in the form which is most like the problem you're working on, then click "Multiply."
Scientific Notation: Division	Divide Two Numbers in Scientific Notation. This page will show you how to divide two numbers. One (or both) of your numbers might be in scientific notation. Fill in the form which is most like the problem you're working on, then click "Divide."
Scientific Notation: Conversion	Convert Between Regular Decimals and Scientific Notation. This page will show you how to convert between writing numbers in scientific notation and in "regular" notation, or from "regular" notation to scientific notation.
Place Value	See What Place Value a Number Has. This selection will help you to find what the place value is of a particular digit in a positive integer number. Type your number here, then click "Take my number," and we'll go from there.
Rounding Numbers	Rounding a number is when you take a number and "bump it up" or "bump it down" to a nearby and "cleaner" number. If you type in a number you wish to round below, and select what place value you want to round it to, this selection will show you how to round it! A number can be rounded to any place value you want. If you type in a number you wish to round below, and select what place value you want to round it to, this selection will show you how to round it!
Ratios: What is a Ratio?	A ratio is a statement of how two numbers compare. It is a comparison of the size of one number to the size of another number. All of the lines below are different ways of stating the same ratio. If you fill in one of the lines below, this selection will explain a few things about your ratio.
Ratios: Proportions	A proportion occurs when two ratios are forced to be equal to each other. This selection will allow you to find a second ratio that is in the same proportion as the first. Since a ratio is made up of two numbers, and a proportion compares 2 ratios, we'll be dealing with 4 numbers here, 2 for each ratio. The first ratio will be between the two numbers represented by a and b. As a ratio, it will be a to b, or a:b. You can choose numbers for a and b below. The second ratio will be between the two numbers represented by c and d. As a ratio, it will be c to d, or c:d. You can choose numbers for c and d below. The proportion below can be stated as: "a is to b as c is to d." This can also be written as a:b::c:d, or in fractional form as a/b=c/d, which is how the fill in blanks appear below.