Year 9
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Lesson details
Key learning points
- In this lesson, we will learn about how useful 100% is, and how we use it to solve various percentage problems.
Licence
This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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5 Questions
Q1.
If the amount of flour in a bag increased by 20%, it would always mean we add 20g on to the amount.
True
Q2.
If I increase 200kg by 30%, then the new amount I have is...
140kg
230kg
260g
Q3.
The decimal multiplier to increase an amount by 53% would be...
0.53
53.0
530.0
Q4.
It is possible to increase an amount by more than 100%
False
Q5.
If you decreased an amount by 60%, the decimal multiplier would be 1.60.
True
5 Questions
Q1.
If 75% of a number is 150, what is my number?
11,250
112.5
225
Q2.
If I buy a car in a 20% off sale and it costs £30,000, how much did the car originally cost?
£6,000
37,500
6,000
Q3.
If I decreased the amount I paid for my car insurance by 90% to £36.50 per year, how much did I pay previously for my car insurance?
£3.65
£32.90
£36.50
Q4.
If a jumper was marked as 56% off and costs £50 now, then 44% of the original cost of the jumper is equal to £50
False
Q5.
If I know something costs £2.10 in a 30% off sale, then I would calculate £2.10 = 70% and scale accordingly to get that 100% = £3 to find the original amount.
False