chapter+2+notes,+pictures,+and+vocabulary

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 * **Term** || **Lesson** || **Definition** ||
 * < **Bar Notation** ||< 2-1 ||< bar notation is often used to indicate that a digit or group of digits repeats. ||
 * < **Base** ||< 2-9 ||< A product of repeated factors can be expressed as a power, that is, using an exponent and a base. ||
 * < **Dimensional Analysis** ||< 2-3 ||< Dimensional analysis is the process of including units of measurement when you compute. You can use dimensional analysis to check whether your answers are reasonable. ||
 * < **Exponent** ||< 2-9 ||< A repeated factors can be expressed as a power, that is, using an exponent and a base. ||
 * < **Like Fractions** ||< 2-5 ||< Fractions that have the same denominators are called like fractions. ||
 * < **Multiplicative Inverse** ||< 2-4 ||< Two numbers with a product of 1 are multiplicative inverses, or reciprocals, of each other. ||
 * < **Power** ||< 2-9 ||< A product of repeated factors can be expressed as a power, that is, using an exponent and a base. ||
 * < **Rational Number** ||< 2-1 ||< Numbers that can be written as fractions are called rational numbers. ||
 * < **Reciprocals** ||< 2-4 ||< Two numbers with a product of 1 are multiplicative inverses, or reciprocals, of each other. ||
 * < **Repeating Decimal** ||< 21 ||< Repeating decimals have a pattern in their digits that repeats without end. ||
 * < **Scientific Notation** ||< 2-10 ||< Scientific notation is a compact way of writing numbers with absolute values that are very large or very small. ||
 * < **Terminating Decimal** ||< 2-1 ||< A decimal like 0.625 is called a terminating decimal because the division ends, or terminates, with a remainder of 0. ||
 * < **Unlike Fractions** ||< 2-6 ||< Fractions with unlike denominators are called unlike fractions. ||



2-1 To change a fraction into a decimal you just divide the top number by the bottom number. EXAMPLE: 1/2 = 0.5

To change a decimal into a fraction you have to look at the number and see what place its in. EXAMPLE: 0.9 = 9/10

Comparing fractions and decimals using < > or = EXAMPLE: 0.5 = 1/2 if you divide one and two you will get 0.5 so they will be equill.

2- 10 3,780,000,000,000,000,000 3.78 x 10 to the 18th power

multiply by 10 count how many numbers after the first number

463,000,000 4.63 x 10 to the 8th power

0.0000013 1.3 x 10 to the -6th power

0.000456 4.56 x 10 to the -4th power