Year 9 Key Words

Algebra 1 and 2 Addition Sum Total Subtraction Difference Number line Product Times-table Multiplication Sequence Term-to-term rule Input Output Rule Algebra Expression Function X-axis Y-axis Equation Lines Plotting

Number 1 Equivalent Unitary method Mixed number Generalise Top heavy Deduce Improper Bracket Cancelling Nested brackets Compound interest Approximate Multiplier Place value Compare Decimal number Significant Decimal fraction Integer Less than Ratio Greater than Simplest form Numerator Proportion Denominator Inverse Convert Reverse percentage

Number 2 Inverse operation Significant figure Rounding Product Approximation Display Decimal place Strategy Pi Strict inequality Memory keys Recurring decimal Brackets Terminating decimal Standard form Upper bound Lower bound

Algebra 3 Intersection Square root Trial and improvement Function Subject Simultaneous Inequality Elimination Inequation Substitution Directly proportional Denominator Linear Cancelling Equation Co – efficient Solve Variable Solution Formula Expression Identity

Algebra 4 Multiple Square root Factor Cube root Square Prime number Cube Prime factor Gradient Speed Power Acceleration Index Axis Quadratic Intercept Cubic

Algebra 5 Expansion Simplify Co – ordinates Parallel Dimension Factorisation Quadratic Linear

Geometry and Measures 1 Corresponding Parallel Triangle Quadrilateral Vertex Mid – point Polygon Arc Chord Circumference Loci Region Congruent Congruence Diameter Sector Segment Inscribed Hypotenuse Pythagoras theorem Chord Angle bisector Radius Perpendicular bisector Equi distant Tessellate Locus Alternate Tangent

Geometry and Measure 2 Diameter Surface area Pi Similar Density Pressure Speed Area Litre Base Volume Perpendicular height Co – ordinate Parallelogram Line segment Capacity Mid- point Cuboid Hectare Circumference Radius Cross – section

Geometry and Measure 3 Plane Symmetry Congruent Congruency Object Angle of depression Image Angle of elevation Centre of enlargement Tangent (tan) Scale factor Cosine (cos) Fractional enlargement Sine (sin)

Geometry and Measures 4 Volume Circumference Generalise Plane of symmetry Area Investigate Perimeter Reflection symmetry Surface area Rotational symmetry

Statistics 1 Line of best fit Quartile Interpret Interquartile range Time series Grouped data Raw data Mean Two way tables Median Tally Bias Frequency Pie chart Criticise Pictogram Bar chart Distribution Scatter graph Cumulative frequency Correlation Upper class boundary Relationship Mid – class value Data Questionnaire Census

Statistics 2 Probability Probability scale Random Repeated experiment Different outcomes Fair Bias Trials Estimate Certain Chance Even chance Equally likely Event Outcome Fair Likely Possible Impossible

Statistics 3 Continuous data Sample size Frequency table Mode Mean Median Extreme value Appropriate data Central value Bar chart Line graph Frequency diagram Time-series graph Stem-and-leaf diagram Survey Questionnaire Experiment Statistics Grouped data Class interval Tally Frequency Data-collection sheet Database Sample Primary source Secondary source Data log Two-way table Discrete