decimal fractions	A fraction written as a decimal point and digits to the right of the decimal point
decimal number	Decimal numbers are numbers whose place value is based on 10s, including whole numbers and decimal fractions, which have decimal points and digits to the right of the decimal point. The numbers 18, 4.12 and 0.008 are all decimal numbers.
dividend	The number to be divided up in a division problem. In the problem 8 ÷ 2 = 4, 8 is the dividend.
divisor	The number that is being divided into the dividend in a division problem. In the problem 8 ÷ 2 = 4, 2 is the divisor.
estimate	An answer to a problem that is close to the exact number, but not necessarily exact.
factor	A number that is multiplied by another number or numbers to get a product. For example, in the equation 4 • 5 = 20, 4 and 5 are factors.
mixed number	An expression in which a whole number is combined with a proper fraction. For example 5 is a mixed number.
place value	The value of a digit based on its position within a number.
power of 10	Any whole number that can be represented by 10^x. The first four powers of 10 are 1, 10, 100, and 1000.
product	The result when two numbers are multiplied. For example, the product of 4 • 5 is 20.
quotient	The result of a division problem. In the problem 8 ÷ 2 = 4, 4 is the quotient.
rounding	Finding a number that’s close to a given number, but is easier to think about.
trailing zero	A placeholder 0 that occurs after the final non-0 digit in a decimal number. In the number 22.0900, the 0s in the thousandths and ten-thousandths places are trailing zeros.