Lesson · Grade 2 · Mathematics
How Likely Is It? Crayons in a Box
- Grade 2
- Mathematics
- 1 min 2 s
- British Columbia
- BC2-MA-21
A box of 4 red, 2 blue and 2 green crayons is counted one at a time, and grabbing one with your eyes closed shows that getting a crayon is certain but its colour is uncertain. Lining the colours up one under another shows that red is more likely than blue, blue is less likely, and blue and green are equally likely.
Concept: How likely is it?
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In one sentence
The question this lesson answers
How likely is it? Let's find out with crayons.
Four red crayons go in the box. One, two, three, four.
Transcript
What the lesson says
How likely is it? Let's find out with crayons.
Four red crayons go in the box. One, two, three, four.
Two blue crayons go in next. One, two.
Two green crayons go in last. One, two.
Close your eyes and grab one crayon.
Will you get a crayon? Yes! The box holds only crayons. It is certain.
Which colour will it be? We cannot be sure. It is uncertain.
Four red and two blue. Four is more than two. So red is more likely than blue.
Blue is less likely than red. But you could still grab blue.
Two blue and two green. Two is the same as two. So blue and green are equally likely.
The more crayons of a colour, the more likely it is.
Curriculum
Where this fits
- British Columbia, Grade 2
Mathematics, Data and probability: likelihood of familiar life events, using comparative languageBC2-MA-21
The outcomes and strands follow the British Columbia curriculum.
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