# Study the word list: GCSE Maths: Numbers 3

Key words for GCSE Maths

 gradient A gradient is how steep a slope is. gram A gram is a thousandth of a kilogram. HCF HCF stands for highest common factor. indices Indices show the power of a quantity. integer An integer is a whole number. irrational An irrational number is a number that is not an integer but cannot be expressed as a common fraction. LCM LCM stands for lowest common multiple. natural Positive or counting numbers are also called natural numbers. numerator The number above the line in a fraction is called a numerator. prime A prime number can only be divided by one and itself. product A product is the result of multiplying two numbers together. rational Integers and decimals are rational numbers. reciprocal The reciprocal of 2 is 1/2. sum The sum of two numbers is calculated by adding them together. triangular Triangular numbers are a pattern of numbers that form an equilateral triangle shape. surd An irrational number that is expressed as the root of a natural number is called a surd. binomial A binomial expression is made up of two terms.

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