Document page
mathematicsprinted 21 · PDF 22
165 pagesrevision 46935
printed 21 · PDF 22
Page image rendered from the stored file at 110 dpi; it sharpens as you zoom. Outlines are placed from each region’s stored position on the page (595 × 842 pt).
readable
Source of this text: embedded text layer. The better of the embedded text and OCR is kept.
21
3. Multiplication = ∗
4. Division = /
Let’s take a question for an example.
Ali bought 10 candies for 12 dollars. Ahmed bought 15 candies for 18 dollars.
They both paid collectively with a 50 dollar note. Calculate the total money
paid for the bill and the change they will receive.
Reading the question more carefully makes us realise that we have to find two
things:
1. Total money paid by them :
We might have to add the money paid by both Mtotal = Mali + Mahmed (1)
2. Change they will receive which is the amount of money they will receive
back so can be calculated as:
C = 50 − Mtotal (2)
So now let’s find out the individual answers. We know that the item bought by
Ali costed 12 dollars and the item bought by Ahmed costed 18 dollars so we
can say:
Mtotal = Mali + Mahmed (3)
1 Mtotal = 12 + 18 (4)
Mtotal = 30 (5)
So we can say their bill was 30 dollars.
Now for the change, we can calculate it as:
C = 50 − Mtotal (6)
C = 50 − 30 (7)
C = 20 (8)
So after paying with a 50 dollar bill, the change they will receive back would
be 20 dollars.
1.2 Conversions between currencies
This part of the syllabus aims to assess your ability to convert from Currency
A to currency B by using a multiplying factor, which will always be given in the
question.
let’s consider the following question to understand the expected concept:
1 dollar = 0.89 euros.
Ali spent 50 dollars on his trip to Paris. Ahmed spent 70 euros on his trip to
Spain. Calculate the number of euros spent by Ali and the number of dollars
spent by Ahmed.
Again, let’s work part by part.
For the first, we’ve been asked to calculate and convert the dollars spent by
Ali to euros so using the conversation rate we can say