Mathematics
Grade 2
15 min
More, less, and equally likely
More, less, and equally likely
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Identify which event is more likely to happen.
Identify which event is less likely to happen.
Identify when events are equally likely to happen.
Use counting to compare the chances of different outcomes.
Explain their reasoning using the words 'more', 'less', or 'equally likely'.
Connect likelihood to real-world situations like games and choices.
Imagine a bag full of yummy fruit! ๐๐๐ If you pick one without looking, which fruit will you probably get?
Today, we will learn about chance! We will use special words like 'more likely', 'less likely', and 'equally likely' to make smart guesses.
Real-World Applications
Guessing if you will pick a red or blue crayon from a box.
Playing a board...
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Key Concepts & Vocabulary
TermDefinitionExample
ChanceChance tells us how possible it is for something to happen. ๐คThe chance of a coin landing on heads is one of two possibilities.
More LikelySomething is more likely if it has a bigger chance of happening. ๐In a bag with 5 red balls and 2 blue balls, picking a red ball is more likely.
Less LikelySomething is less likely if it has a smaller chance of happening. ๐In a bag with 5 red balls and 2 blue balls, picking a blue ball is less likely.
Equally LikelyThings are equally likely if they have the same chance of happening. โ๏ธIf a spinner has 1 red part and 1 blue part of the same size, landing on red or blue is equally likely.
OutcomeAn outcome is what happens after you do something, like picking a color. ๐จWhen you roll a die, one outcome is rolling a 4.
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Core Formulas
The More Likely Rule
Count(Choice A) > Count(Choice B)
If the count of one choice is bigger, it is more likely to be picked.
The Less Likely Rule
Count(Choice A) < Count(Choice B)
If the count of one choice is smaller, it is less likely to be picked.
The Equally Likely Rule
Count(Choice A) = Count(Choice B)
If the counts of two choices are the same, they are equally likely to be picked.
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Challenging
A box has 10 red crayons and 6 blue crayons. How many red crayons must you **take away** to make picking a red or a blue crayon **equally likely**?
A.10
B.6
C.5
D.4
Challenging
Sam wants to make a spinner where it is **equally likely** to land on Red or Blue. Which spinner should he make?
A.spinner with 3 equal red parts and 1 equal blue part.
B.spinner with 1 big red part and 1 small blue part.
C.spinner with 2 equal red parts, 1 equal blue part, and 1 equal green part.
D.spinner with 2 equal red parts and 2 equal blue parts.
Challenging
A jar has 7 green marbles and 7 yellow marbles. Maria takes out one green marble and does not put it back. Now, if you pick a marble, what is true?
A.It is more likely to pick a green marble.
B.It is more likely to pick a yellow marble.
C.It is still equally likely to pick green or yellow.
D.It is impossible to pick a green marble.
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