percentage change:

Question

Percentage change
(a) One calculation below gives the answer to the question
What is 70 increased by 9%?
Tick (
) the correct one.
70 × 0.9 70 × 1.9 70 × 0.09 70 × 1.09

Choose one of the other calculations.
Write a question about percentages that this calculation represents.
calculation chosen: .......................
question it represents:

Now do the same for one of the remaining two calculations.
calculation chosen: .......................
question it represents:

Answer 1

I was quite delighted when I realized that I could type faster than I could write (my career was as a computer specialist/manager).   I think you could have solved this problem much faster than you typed it.

 

"Per cent" means "per hundredth"  (think of a cent being a hundredth of a dollar)

 

"Increase" means more than.  So, a 9% increase means 1.09 times the value  (1 for the original value plus 0.09 for the 9% increase).

 

The problem also gives --

     --  90% of 70

     --  70 increased by 90%

     --  9% of 70

     --  70 increased by 9%