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Maths year 9 flashcards
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- 1£240 earns 13% interest How much is there?I) use a multiplier:
=240 x 1.13
=£271.20 - 2£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 - 3Upper and Lower Bounds1) 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 - 42.4 - What level of accuracy has this been rounded off to?2.4 + 0.5 = 2.45
2.4 - 0.5 = 2.35 - 5Upper and Lower Bounds: To find the biggest and smallest answersBiggest: Upper Bound A / Lower Bound B
Smallest : Lower Bound A / Upper Bound B - 6How to convert a recurring decimal into a fractionLet 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 - 7To find a recurring decimal from a fractionTURN FRACTION INTO SIMPLEST FORM:
Find the prime factors of the denominator
If they are anything OTHER than just 2 & 5, it is recurring - 8Is 2/7 Recurring or Terminating?Denominator = 7
Prime factors of 7 = 7 & 1
They are NOT 2 or 5
= 2/7 = Recurring - 9INterest = INcreaseWhen there is an interest, the value will always go UP.
- 10RULE: Angles in a polygon = (n-2) x 180e.g. sum of interior angles of a polygon with 20 sides
= (n-2) x 180
= (20-2) x 180
= 18 x 180
=3240 - 11EXTERIOR ANGLES: Sum of Exterior Angles in a Polygon = 360 degreese.g. Triangle :
Interior angles = 180 degrees
Exterior angles = 360 degrees - 12Finding the Exterior Angle in a TriangleA + B = C degrees
This only works with OPPOSITES OF AN EXTERIOR - 13Angles on parallel lines: Z AnglesAlternate are EQUAL
- 14F AnglesCorresponding are EQUAL
- 15C AnglesSupplementary angles = 180 degrees
- 16X AnglesOpposite angles are EQUAL
- 17BearingsAlways measure from NORTH
Always go round CLOCKWISE
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- Fichas sobre Maths year 9 flashcards, creado por Sara L-F el 22/05/2015.
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- Sara L-F
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