# Chapter 03 - the Visible Pc

**Topics:**Equals sign, Assignment, Relational operator

**Pages:**2 (310 words)

**Published:**January 19, 2013

words, and to write in sentences? And did you

remember to use the unrounded value 1714 from

part (a), not the rounded value 1710? If you used

the rounded value, then you will have obtained the

answer 51%, which is not the answer given in the

question.

Activity 34

See how many of the following possible

improvements you spotted – but don’t worry if you

didn’t spot them all! The author of the solution

could:

• explain the calculations in words and write in

sentences

• include a conclusion for each question part,

stating the answer clearly in the context of the

question

• include the units in part (a)

• round the answer to part (a) to three

significant figures, as requested in the question

• check the answer to part (b) against the given

answer of 52%, and try to find the mistake

• correct the mistake – the amount of paper

recycled five years ago was 1130 tonnes, not

1714 tonnes, so the increase as a fraction of the

584 584

amount five years ago is ,not

1130 1714

• write .34 as 0.34 – a decimal point should have

a digit on each side to make it easy to read –

it’s easy to mistake .34 for 34

• write 0.34 as the percentage 34%, since the

question referred to the percentage rise

• use equals signs correctly – see the text

following the activity.

Activity 35

The equals sign in

584

584 =

1714

is used incorrectly. The fraction on the right-hand

side is not equal to 584.

The equals sign in

584

= .34

1714

is also used incorrectly. The fraction on the left is

not exactly equal to 0.34, so the author of the

solution should have either used the approximately

equals sign or included the rounding precision.

That is, he or she should have written either

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