Page 273 - Math Smart - 7

If! In this chapter
CHAPTER 12.1

■" -r=-*.r
II
,ij
.
Understanding Pupils should be able to:
• understand percentage
Percentages as the number of parts
in every 100
• use fractions and
percentages to
^ RECALL describe parts of
shapes, quantities and
measures
O What percentage of each figure is shaded?

a) b)

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■ fti
1
Mm m !f5
m

%
%
O Convert these fractions into percentages.
a) ^ = % b) g = % c) -^ = %
200
'
O Convert these fractions into percentages. Round your answers to
1 decimal place.
' ' 8
a) % b) 15 % c) 121 = %
180

Percentages as parts of a whole A percentage is

a fraction with a
The large square is divided into 100 equal parts. denominator of 100.
1 part is coloured.
gp of the large square is coloured. 'Cent' is a word that
is commonly used in
We say that 1 percent or 1 % of the large square systems of measure
is coloured. The word 'percent' comes from the where there are one
Latin phrase, per centum, which means 'per hundred'. hundred smaller
units to one larger
We use the symbol, %, for percent. unit. Examples are
We say the percentage of the large square that cents in a dollar and
is coloured is 1 % or one percent. centimetres in a
Percentages can be used to describe part of a whole metre.
in the same way as fractions.