GCSE Mathematics WJEC

This subject is broken down into 114 topics in 5 modules:

  1. Number 23 topics
  2. Surds 10 topics
  3. Algebra 30 topics
  4. Geometry and Measure 28 topics
  5. Statistics 23 topics
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  • 5
    modules
  • 114
    topics
  • 38,200
    words of revision content
  • 4+
    hours of audio lessons

This page was last modified on 28 September 2024.

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Mathematics

Number

Calculating Tips

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Calculating Tips

  • The ability to calculate tips is a practical application of percentages, an important concept in number mathematics.
  • Remember that "percentage" literally means "per 100", so 15% is the same as 15 out of 100, or 0.15 in decimal form.
  • To find the amount of a tip, multiply the total bill by the tip rate. If a bill is £25 and you wish to leave a 20% tip, calculate 25 * 0.20 = £5.
  • Many people find it helpful to work out a 10% tip first and then adjust appropriately. To get 10%, simply move the decimal point one place to the left.
  • If you want to leave a 15% tip, figure out 10%, then halve that number to find 5%, and add the two amounts together.
  • The tip is usually given in addition to the total bill, so add the tip amount to the cost of the total bill to give the total amount to pay.
  • Always check your calculation. If the percentage tip seems too high or low for the total cost, you may have made a mistake in your calculation.
  • Practice makes perfect. Try to calculate the tip quickly and accurately without using a calculator. This skill not only comes in handy in everyday life, but also helps you to understand and apply percentage calculations more effectively.

Course material for Mathematics, module Number, topic Calculating Tips

Mathematics

Algebra

Harder Graphs

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Harder Graphs

  • Uncover the usage and properties of quadratic graphs, which illustrate equations of the form y = ax² + bx + c. Remember, the value of 'a' influences the shape and direction of the graph.

  • Explore the features of cubic graphs, represented by y = ax³ + bx² + cx + d. Understand how the value of 'a' influences the graph’s shape and direction.

  • Delve into the concepts of reciprocal graphs, y = a/x and y = a/(x + h), and understand their unique hyperbolic shapes.

  • Familiarise yourself with the idea of transformation of graphs. This encompasses translations (moving the graph), reflections (flipping the graph), and stretches (changing the shape of the graph).

  • Analyse graphs that depict real-life applications like distance-time or speed-time graphs. Not only will this require plotting skills, but also interpreting what the graph means in context.

  • Learn about the importance of the line of symmetry in a parabola. This line passes through the vertex of the parabola and divides the parabola into two perfect halves.

  • Familiarise yourself with a graph's key features, including the y-intercept (where the graph crosses the y-axis), x-intercept (where the graph crosses the x-axis) and turning points or vertices.

  • Understand the fundamentals of simultaneous equations involving a linear and a quadratic equation. To solve these, you can substitute the linear equation into the quadratic equation, and sketch the graphs to find the points of intersection.

  • Discover methods to interpret and build distance-time graphs. Understand that the slope of the line in a distance-time graph signifies speed.

  • Unearth techniques for recognising underlying graph shapes from equations, and for sketching graphs with considerations of important areas like intercepts and turning points.

Course material for Mathematics, module Algebra, topic Harder Graphs

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