Page 30 - steps 3b.pdf

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• What's the chance? • • • • • •••••••••• coloured stickers,
blank dice
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PAGE 50 Jimmy, Ela, Morag and Gary 6 :1 Design two more spinners, a and b.
are playing a game. Each player has an equal chance of winning.
They take turns to spin Spinner 0:
a colour spinner. Spinner b: Jimmy and Ela have a good chance of winning
If they spin the colour of their T-shirts, but Morag and Gory have a poor chance.
they win a point.
The first to win 4 points
wins the game. 7 J Use stickers in two colours and a blank dice.
Make a dice using both colours, one sticker on each face.
For this spinner, write:
2 Predict how many times each colour will occur in 60 rolls.
a who has the best chance of winning? 3 Write down your prediction.
b who has the poorest chance of winning?
c which players have 4 Make 60 rolls and, each time, keep a note of the colour.
an equal chance of winning? (Choose your own way to do this).
5 Afterwards, write the total number of rolls for each colour.
Now do the same for these spinners.
Was your prediction nearly right?

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tm] ISTEPS 3b:21! !STEPS 3b:21! III

rn 00 00 [ID [1J

a Ela a Jimmy a Gary Practical: Practical: using stickers of two
colours on a blank dice, then
b Gary b Gary b Morag a designing a spinner to give equal making and testing a prediction.
chance of winning - i.e. two
c Jimmy and Morag c Ela and Morag c Ela and Jimmy (1/3 a,d)
parts of equal area.
~ ~ b designing a spinner with parts of
unequal area.
a Morag a Gary or Jimmy

b Ela, Gary or Jimmy b Ela or Morag
c Ela, Gary and Jimmy c Gary and Jimmy or
Ela and Morag