Page 13 - 04MATY4 318 STEwsh DRM_Neat

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I • More triangle angles •••• • Seeing percentages • • • I RM36 I

"" <;C1J.~~
Jo.nuni·bered the corners of a paper triangle Per cent means 'out of a hundred' I ~:l'NS'1'~
ana tore it into three pieces. ~ PAGE lq
~ The symbol for per cent IS %
'D~" If 20 parts out of 1 00 are coloured
Then she drew a straight line. It IS wntten as 20% coloured
". . ., . __ ~J> ~
She found that the corners IJJ
fitted together on the line. For each shape, write the percentage coloured green.
a b
She glued them down to
show her teacher.

[[] For each shape in IJJ . write the percentage coloured purple.
o Colour the grids on RM 36 like this:
a Grid 1 b Grid 2 c Grid 3 d Grid 4 rn
10% orange 20% red 50% orange 70% blue
30% blue 40% green 50% purple 10% red
m Experiment with different triangles to find out
if what Jo thinks is true. a 20% green
Underneath each grid on RM 36, write the percentage not coloured.
@] For each of these shapes, write the percentage which is blue. b 70% green
a b c
e 40% green
00

a 80% purple
---
[[] Afterwards, write down what you discover. []] Now write each amount coloured blue as a fraction. b 300/0 purple
1m m--
e 60% purple

rn

Practical: experimenting with different triangles Practical: colouring grids on RM 36.
to confirm that the three corners of a triangle will a Grid 1 b Grid 2 e Grid 3 d Grid 4
form a straight angle. 10 % orange 20% red 50% orange 70% blue
30% blue 40% green 50% purple 10 % red

~
The three corners of any triangle together make
a straight angle. Grid 1 Grid 2 Grid 3 Grid 4
60% not coloured 40% not coloured 0% not coloured 20% not coloured

[ID

a 25% blue b 40% blue e 75% blue a t b To or ~ e .3.
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