##### Key Words and Meanings - Year 8 Maths
• Types of Numbers, Equations, Angles, Constructions and Probability
 Multiplication The basic idea of multiplication is repeated addition. Division Division is splitting into equal parts or groups. It is the result of "fair sharing". We use the ÷ symbol, or sometimes the / symbol to mean divide Factor Factors are numbers we can multiply together to get another number HCF The highest number that divides exactly into two or more numbers. Multiple The result of multiplying a number by an integer (not by a fraction). LCM The smallest positive number that is a multiple of two or more numbers. Power The power of a number says how many times to use the number in a multiplication. It is written as a small number to the right and above the base number. Root Where a function equals zero Prime A Prime Number is a number that has two distinct factors, itself and one. Parallel Always the same distance apart and never touching.
• Percentages, Congruent Shapes, Further Sequences, Surface Area and the Volume of a Prism
 Calculation To work out an answer, usually by adding, multiplying etc. Percentage Percent means parts per 100 The symbol is % Congruent The same shape and size. Two shapes are congruent when you can Turn, Flip and/or Slide one so it fits exactly on the other. Sequence A list of numbers or objects in a special order. nth term A formula that describes the pattern in a linear or quadratic sequence. Fibonacci The sequence of numbers: 0,1,1,2,3,5,8,13,21,... Each number equals the sum of the two numbers before it. Prism A solid object with two identical ends and flat sides. The shape of the ends give the prism a name, such as "triangular prism" • The cross section is the same all along its length • The sides are parallelograms (4-sided shape with opposites sides p
• Graphs, Powers & Significant Figures, Drawing & Interpreting Tables & Graphs
 Graph A diagram of values, usually shown as lines or bars. Linear An equation that makes a straight line when it is graphed. Equation An equation says that two things are equal. It will have an equals sign "=" like this: Gradient How steep a straight line is. Also called "slope". Quadratic An equation where the highest exponent of the variable (usually "x") is a square (2). So it will have something like x2, but not x3 etc. A Quadratic Equation is usually written ax2 + bx + c = 0 Power The power of a number says how many times to use the number in a multiplication. It is written as a small number to the right and above the base number. Significant Figure each of the digits of a number that are used to express it to the required degree of accuracy, starting from the first non-zero digit. Standard Form Another name for "Scientific Notation", where a number is written in two parts: • First: just the digits (with the decimal point placed after the first digit), • Followed by: ×10 to a power that will the decimal point back where it should be. Diagram A drawing used to describe something. Scatter Graph A graph of plotted points that show the relationship between two sets of data.
• Algebraic Expressions, Shape & Ratio
 Algebra Algebra uses letters (like x or y) or other symbols in place of values, and plays with them using special rules. Like Terms "Like terms" are terms whose variables (and their exponents such as the 2 in x2) are the same. In other words, terms that are "like" each other. Expanding brackets Expand is when we remove the ( ) Algebraic expression Numbers, symbols and operators (such as + and ×) grouped together that show the value of something. Index Notation The index of a number says how many times to use the number in a multiplication. It is written as a small number to the right and above the base number. Ratio A ratio shows the relative sizes of two or more values. Ratios can be shown in different ways. Using the ":" to separate example values, or as a single number by dividing one value by the total. Area The size of a surface. The amount of space inside the boundary of a flat (2-dimensional) object such as a triangle or circle. Volume The amount of 3-dimensional space an object occupies. Capacity. Scale The ratio of the length in a drawing (or model) to the length of the real thing
• Fractions & Decimals, Direct & Indirect Proportion & Circles
 Fraction Part of a whole. Integer A number with no fractional part. Multiplication The basic idea of multiplication is repeated addition. But as well as multiplying by whole numbers, we can also multiply by fractions, decimals and more. Division Division is splitting into equal parts or groups. It is the result of "fair sharing". We use the ÷ symbol, or sometime Circumference The distance around the edge of a circle (or any curvy shape). It is a type of perimeter Formula A special type of equation that shows the relationship between different variables. Area The size of a surface. The amount of space inside the boundary of a flat (2-dimensional) object such as a triangle or circle.
• Equations & Formulae, Comparing Statistical Distributions & Statistical Investigation
 Equation An equation says that two things are equal. It will have an equals sign "=" like this: Variable A symbol for a number we don't know yet. It is usually a letter like x or y. Formulae A special type of equation that shows the relationship between different variables. Frequency How often something happens (usually during a period of time). Polygon A plane shape (two-dimensional) with straight sides.