Mathematics (9-1) - 0980 CIE

Percentages

Gbogbo ọrọ náà

Percentages are the language money speaks. A discount in a sale, the interest on a loan, a test score, a pay rise, the VAT on a receipt: all of them are percentages, and being quick with them is one of the most useful everyday skills mathematics gives you. A percentage is simply a fraction out of 100, which is exactly what makes comparisons so easy.

In this lesson you will learn to find a percentage of an amount, write one quantity as a percentage of another, and handle percentage increases and decreases with confidence. You will then meet the two ideas examiners love to test: the difference between simple and compound interest, and reverse percentages, where you work backwards from the final amount to the original. Master these and a whole class of exam questions becomes routine.

Ebumnobi

Calculate a given percentage of a quantity.
Express one quantity as a percentage of another.
Calculate percentage increase or decrease.
Calculate with simple and compound interest.
Calculate using reverse percentages. (Extended only)

Akọmọ Ojú-ẹkọ

Every time you see a price drop, a bank statement, an exam mark or a population change reported as a percentage, the same small toolkit is at work. Because a percentage is a number out of 100, it lets you compare things fairly even when the totals are different. Getting fluent here pays off across the whole syllabus and well beyond the exam.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Percentages. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

What is 15% of 240? A. 16 B. 36 C. 255 D. 360 Answer: B
A jacket costing $80 is reduced by 15% in a sale. What is the sale price? A. $12 B. $65 C. $68 D. $92 Answer: C
A student scored 18 out of 40 in a test. What percentage is this? A. 18% B. 22% C. 40% D. 45% Answer: D
$2000 is invested at 5% per year compound interest. What is the value after 2 years? A. $2100.00 B. $2200.00 C. $2205.00 D. $2210.00 Answer: C
After a 20% reduction, a coat costs $96. What was the original price? A. $76.80 B. $115.20 C. $120.00 D. $480.00 Answer: C