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- 1Maths Unit 3Percentage Increase = actual increase/original
Percentage Decrease = actual decrease/original
percentage profit = percentage increase
percentage loss = percentage decrease - 2Compound Interest: Find the compound interest if £10000 for 4 years at 11%p.a 100% + 11% = 111% 111/100 = 1.11 £10000 * 1.11 (to the power of 4) = £15180.70Simple Interest:
This means work out the interest for 1 year then multiply by the number of years. - 3Find the simple interest on a loan of £2800 borrowed for 5 years at a rate of 8.8% p.a.8.8 / 100 = 0.088
0.088 * 2800 * 5 - 4Reverse Percentages: Rose reduces her hours at work a little and takes an 8% pay cut. She now earns £202.40 each week. What was her weekly pay before she reduced her hours?100% - 8% = 92%
202.40 / 92 * 100 = £220 - 5Ratio: Share £480 between Carol, Maggie and Peter in the ratio 5:3:4.5 + 3 + 4 = 12
480 / 12 = 40
Carol = 40 * 5 = £900
Maggie = 40 * 3 = £120
Peter = 40 * 4 = £160 - 6Polygons: To find the sum of interior angles of any polygon with n sides is 180 (n - 2).The exterior angles of a polygon add up to 360 degrees. If a regular polygon has n sides, each exterior angle = 360/n
- 7—The angle at the centre of a circle is twice the angle at the circumference.
- 8—the angle in a semi-circle is 90 degrees
- 9—Angles at the circumference are equal
- 10—The angle between a tangent and a radius is 90 degrees.
- 11—Tangents from a point to a circle is equal in length
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- Karteikarten am Ohne Titel, erstellt von aj02firestar am 08/12/2014.
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