Calculator questions

Question 1

What does compound interest mean?

Answer 1

Using a single multiplier to increase an amount (usually money) several times

Question 2

What does depreciation mean?

Answer 2

Decreasing an amount using a single multiplier several times.

Question 3

How would you work out reverse percentages?

Answer 3

To find the original number, you would have to use the number you are given over the percentage it is of the original number. e.g. A radio is £63 after a 40% increase in price. What was the original number? 
140% = £63
1% = 63/140
1% = 0.45
100% = £45

Question 4

What is standard form?

Answer 4

The easiest way to write down a very large number or a very small decimal number.
e.g. 1230000000 = 1.23 x 10^9

Question 5

What is the quadratic formula?

Answer 5

x= (-b +|- root b^2 + 4ac) over 2a

Question 6

Write 1.462 x 10^-4 as an ordinary number.

Answer 6

0.0001462

Question 7

David puts £3000 in a savings account with a compound interest rate of 3% per annum. How much money would he have after 4 years? Round your answer to 2 d.p.

Answer 7

£3376.53

Question 8

Expand and simplify:

x^2 - 3) (2x + 4

Answer 8

2x^3 + 4x^2 - 6x - 12

Question 9

If tan(x) = 3.54, how would you work out x?

Answer 9

tan^-1(3.54)

Question 10

What does the +|- symbol mean in quadratic formula?

Answer 10

Positive or negative

Question 11

When you label a trapezium, what are a, b and h?

Answer 11

a and b are the two parallel lengths and h is the height

Question 12

What are upper and lower bounds?

Answer 12

Upper bounds are the highest possible amount it could be,

Lower bounds are the lowest possible amount it could be.