ISLAMIYA ENGLISH SCHOOL, ABU DHABI.



GRADE : 7 PERCENTAGES CHAPTER: 15KEY POINTS:Percentage increase.Example :-Increase a quantity by 8%.Find the multiplying factor.Multiply the given quantity by the multiplying factor.The multiplying factor is found by adding the percentage to 100 and dividing by 100.Ie. 100+8100=108100.The new quantity is 108% of the original quantity.Percentage decrease.Example :-decrease a quantity by 15%.Find the multiplying factor.Multiply the given quantity by the multiplying factor.The multiplying factor is found by subtracting the given percentage from 100 and dividing by 100.ie. 100-15100=85100.The new quantity is 85% of the original quantity.PART – AExpress 425As a percentage.As a decimal.Express 0.85As a percentage.As a common fraction in its lowest terms.Express 64%As a decimal.As a common fraction in its lowest terms.Express 6 mm as a percentage of 3 cm.Find 35% of 120 m2.If 80% of the children in a class have black eyes, what percentage does not?If a number is increased by 25% what percentage is the new number of the original number?If a number is decreased by 42% what percentage is the new number of the original number?What multiplying factor would increase a quantity by 45%?What multiplying factor would decrease a quantity by 18%?PART – BIncrease 300 by 75%.Decrease 400 by 8%. 5% increase in 25 km.12?% increase in a speed of 600 km/h.Increase 70 cm by 7%. Increase 54 m by 36%.Increase 31 kg by 100%.Decrease 800 g by 2.5%.Decrease 30% in a temperature of 40° Celsius.Decrease 64 sheep by 70%.PART – C (Bravo!)The enrolment in a school increased by 15% from the year 2012 to 2013. If 1500 enrolled in 2012, how many enrolled in 2013?The purchase price of an ipad is ?650. What is the total price if the sales tax rate is 8%?A store marks up merchandise 40% for profit. If an item costs the store ?12, what is the selling price?Yahoo has a staff of 6200 employees. Next month, Yahoo will decrease its staff by 8%. How many people will be employed by Yahoo next month?A persons’ salary of ?1250 is increased by 2.5%. What is his current salary?x----------------x-------------------x ................
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