Maths

• Converting to percentages


  1. Multiply by 100

  2. 66-6%

  3. 0.56 x 100 = 56%

  4. 64%
• Adding fractions


  1. Find common denominator

  2. Keep first fraction

  3. Flip last fraction

  4. Change sign
• Simple Interest


  Same amount of interest each year
• Identity


  The left side always equals the right side
• Angles


  Straight line angles add up to 180°

  Angles at a point add up to 360°

  Angles in a triangle add up to 180°

  Angles in a quadrilateral add up to 360°
• Volume


  The amount of 3D space occupied by an object
• Speed/Distance/Time


  Volume = Area of cross-section x Length
• Sector (POQ)


  Area of triangle
• Units used are Squared (mm², cm², m²)
• Cylinder Total Surface Area

  2πrh + 2πr²
• Cuboid Total Surface Area

  2(lw + lh + wh)
• Prism Total Surface Area

  2 × Area of base + Perimeter of base × height
• Speed/Distance


  Speed = Distance / Time
• Cuboid Volume = 5 × 3 × 2 = 30 cm³
• Cylinder Volume


  π × r² × h
• Volume


  Area of cross-section × Length
• Triangular Prism


  • Area of base × Length
• Straight line graphs have the equation y = mx + c
• Length of a line = √((x₂ - x₁)² + (y₂ - y₁)²)
• Perpendicular lines have gradients that are negative reciprocals