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| Question | Answer |
| £240 earns 13% interest How much is there? | I) use a multiplier: =240 x 1.13 =£271.20 |
| £400 is invested at 6% for 5 years How much is there after 5 years? | (no of years) =STARTING AMOUNT X MULTIPLYER (5) = £400 x 1.06 = £5352.90 |
| Upper and Lower Bounds | 1) Find the level of accuracy 2) Half this level - This is the tolerance 3) - Add this to find the upper bound - Take it to find the lower bound |
| 2.4 - What level of accuracy has this been rounded off to? | 2.4 + 0.5 = 2.45 2.4 - 0.5 = 2.35 |
| Upper and Lower Bounds: To find the biggest and smallest answers | Biggest: Upper Bound A / Lower Bound B Smallest : Lower Bound A / Upper Bound B |
| How to convert a recurring decimal into a fraction | Let x = 0.222... Therefore, 10x = 2.222... Subtract these, 10x- x = 9x = 10x- x = 2.222...- 0.222... =9x = 2 so x = 2/9 so 0.222... = 2/9 |
| To find a recurring decimal from a fraction | TURN FRACTION INTO SIMPLEST FORM: Find the prime factors of the denominator If they are anything OTHER than just 2 & 5, it is recurring |
| Is 2/7 Recurring or Terminating? | Denominator = 7 Prime factors of 7 = 7 & 1 They are NOT 2 or 5 = 2/7 = Recurring |
| INterest = INcrease | When there is an interest, the value will always go UP. |
| RULE: Angles in a polygon = (n-2) x 180 | e.g. sum of interior angles of a polygon with 20 sides = (n-2) x 180 = (20-2) x 180 = 18 x 180 =3240 |
| EXTERIOR ANGLES: Sum of Exterior Angles in a Polygon = 360 degrees | e.g. Triangle : Interior angles = 180 degrees Exterior angles = 360 degrees |
| Finding the Exterior Angle in a Triangle | A + B = C degrees This only works with OPPOSITES OF AN EXTERIOR |
| Angles on parallel lines: Z Angles | Alternate are EQUAL |
| F Angles | Corresponding are EQUAL |
| C Angles | Supplementary angles = 180 degrees |
| X Angles | Opposite angles are EQUAL |
| Bearings | Always measure from NORTH Always go round CLOCKWISE |
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