MY MATHS REVISION

• What is the mean?

  Total of all numbers divided by how many numbers there are.
• What is the median?

  The middle number in a list of ordered numbers.
• What is the mode?

  The most common number in a list.
• What is the range?

  The difference between the biggest and smallest numbers in a list.
• How do you find a percentage on a calculator?

  Multiply the number by the percentage and divide by 100.
• If an equation has a positive and a negative (or vice versa) number... what will the answer be?

  It will be a negative number.
• If an equation has 2 positive numbers or 2 negative numbers... what will the answer be?

  It will be a positive number.
• How do you find a fraction of a number?

  You divide by the denominator then multiply that answer by the numerator.
• How do you work out speed/distance and time?

  Speed = distance x time

  Distance = speed divided by time

  Time = distance divided by speed
• If an algebra question is: x + x + x ... what would the answer be?

  3x
• What is 1cm in mm?

  10 mm
• What is 1km in metres?

  1000 meters
• What is 1m in cm?

  100 cm
• What is 1kg in grams?

  1000 grams
• What is 1L in ml?

  1000 ml
• What is 1 tonne in kg?

  1000 kg
• What is 1g in milligrams?

  1000
• What is 8km in miles?

  5 miles
• What is 10ml in centilitres?

  1 centilitre
• 1 ml = 1 cm$3$
• List as many parts of a circle as you can:

  Circumference

  Segment

  Radius

  Diametre

  Sector

  Arc
• What is the formula for area of a circle?

  pie x radius squared
• What is the formula for surface area of a circle?

  4 x pie radius squared
• What is the formula for the circumference of a circle?

  pie x diametre
• What is the formula for the radius of a circle?

  Diametre divided by 2
• What does this sign mean: <

  Less than
• What does this sign mean: >

  Greater than
• What does this sign mean: ≥

  Greater than or equal too
• What does this sign mean: ≤

  Less than or equal too
• What does this sign mean: ≠

  Not equal too
• What does this sign mean: ≈

  Approximately
• What does BIDMAS stand for?

  Brackets

  Indices

  Divide

  Multiply

  Add

  Subtract
• How do you work out simple interest?

  Principal amount x Rate (interest) x Time
• How to work out compound interest?

  Find the multiplier (100% + 4% = 104% = 1.04 is the multiplier).

  Times the amount of money invested by the multiplier ... to the power of how many years.
• What lines meet at a 90 degree angle?

  Perpendicular lines.
• What lines have the same distance/length apart but never meet?

  Parallel lines.
• What lines are a straight line across?

  Horizontal lines.
• What lines are straight upwards/downwards?

  Vertical lines.
• What lines are straight corner to corner?

  Diagonal lines.
• What lines cross but don't make a 90 degree angle?

  Intersecting lines.