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| +, - | Math Dictionary |
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 bar code Bar codes store a series of encoded numbers - they can be read by laser scanners. There are bar codes on most things that are for sale in stores and many other items that need to be tracked (like train cars). |
 bar graph A bar graph is a type of graph that visually displays information using a series of bars or rectangles. |
 base The base is the bottom of a geometric figure, like the bottom of a cone. The base is defined as the side opposite a vertex. |
base In a number system, a base is the number upon which the system is based. For example, the numbers used in everyday life are base 10 numbers - each place value is a power of 10. Numbers can be written in any integer base, two or greater. In base two, each place value is a power of 2 (and only the numbers 0 and 1 are used). In base 8, each place value is a power of 8 (and only the numbers 0 through 7 are used). |
| 1,000,000,000 billion A billion is a thousand million or ten to the ninth power. The Earth is billions of years old and there are billions of stars in the sky. |
binary number system The binary number system is a way of expressing numbers in base two. Each place value is a power of 2 (in our ordinary base ten system, each place value is a power of 10). Only the numbers 0 and 1 are used in this system. For example, in the binary number system, 11 represents the number 3, and 101 represents the number 5. |
2x + 3y binomial A binomial is a polynomial expression that has two terms, like 3x2 + 4yz. |
bisect To bisect is to divide into two equal (congruent) parts. For example, if you bisect a 90 degree angle, you divide it into two 45 degree angles. |
bisector A bisector is is a line or ray that divides something (an angle, line segment or arc) into two equal (congruent) parts. |
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| Counting | Addition | Subtraction | Multiplication | Division |
| Number Line | Fractions | Decimals | Rounding | Graphs |
Click on an underlined word for more information on that subject. If the math term you are looking for is not in the dictionary, please e-mail us.
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