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Year 9 Maths

Number, algebra, measurement, geometry, statistics foundations.

22 lessons22 Q&A tests2 free to try
01Directed numbersAdd, subtract, and order integers, including negatives. Free 02Order of operationsUse BEDMAS so an expression always works out the same way. Free 03Fractions, decimals and percentagesSwitch between fractions, decimals, and percentages without fuss. ๐Ÿ”’ Members 04Percentage increase and decreaseFind the new amount after a percent up or down. ๐Ÿ”’ Members 05Ratio and ratesShare amounts in a ratio and work with everyday rates. ๐Ÿ”’ Members 06GSTAdd or strip 15% GST on New Zealand prices. ๐Ÿ”’ Members 07Indices and powersWrite and evaluate powers, including the simple index laws. ๐Ÿ”’ Members 08Square roots and irrationalsFind square roots and spot numbers that are not rational. ๐Ÿ”’ Members 09Algebraic expressionsCollect like terms and substitute a value for a letter. ๐Ÿ”’ Members 10Expanding bracketsMultiply out a bracket and tidy the result. ๐Ÿ”’ Members 11Solving linear equationsSolve an equation with one unknown, including negatives. ๐Ÿ”’ Members 12InequationsSolve a simple inequation and show it on a number line. ๐Ÿ”’ Members 13Tables, patterns and rulesFind a rule from a table of values and use it. ๐Ÿ”’ Members 14Straight-line graphsPlot y = mx + c and read a point off the line. ๐Ÿ”’ Members 15Gradient and interceptRead gradient and y-intercept from a graph or an equation. ๐Ÿ”’ Members 16Perimeter and area of polygonsFind perimeter and area of triangles, rectangles, and simple composites. ๐Ÿ”’ Members 17Circles: circumference and areaUse C = 2ฯ€r and A = ฯ€rยฒ, with metres. ๐Ÿ”’ Members 18Volume of prismsFind the volume of rectangular and triangular prisms. ๐Ÿ”’ Members 19Angle facts and parallel linesUse angle facts, including corresponding and alternate angles. ๐Ÿ”’ Members 20Pythagoras in 2DFind a missing side in a right-angled triangle. ๐Ÿ”’ Members 21Mean, median and rangeCalculate mean, median, and range from a small data set. ๐Ÿ”’ Members 22Simple probabilityWrite a probability as a fraction, a decimal, or a percentage. ๐Ÿ”’ Members