# Wikijunior:Introduction to Mathematics/Glossary

**decimal** - a small circle that separates the whole part and fraction part in a decimal number
**decimal number** - a way to show a mixed fraction with the whole part to the left of a decimal and the fraction part to the right of the decimal
**decimal place** - Similar to *place amounts*, every decimal place shows one tenth of the amount to the place to the left.
**denominator** - The bottom number in a fraction, it shows if the pieces of a whole number are big or small.

**fraction** - a number that shows only part of a whole amount

**mixed fraction** - a fraction and a whole number together

**negative number** - A number that is less than zero, it shows a lack of something.
**number line** - A way of showing positive and negative numbers, it shows all the numbers as marks on a line.
**numeral** - Signs such as *1*, *6*, or *4*, they are used to show numbers.
**numerator** - The top number in a fraction, it shows the number of pieces of a whole number.

**place amount** - the amount a numeral shows because of its position in a number
**positive number** - a number that is greater than zero

**whole number** - A normal number like a person uses for counting, it can show an amount of single things. Negative numbers can be whole numbers too.