Mathematics
Grade 1
15 min
More, less, and equally likely
More, less, and equally likely
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1
Introduction & Learning Objectives
Learning Objectives
Identify which outcome is more likely to happen.
Identify which outcome is less likely to happen.
Identify when outcomes are equally likely.
Use counting to compare the chances of events.
Explain their choice using the words 'more', 'less', or 'equal'.
Predict an outcome based on a set of objects.
If you have a bag with 5 cookies 🍪 and 1 apple 🍎, which are you more likely to pick?
Today, we will learn about chances! We will use special words. These words are 'more likely', 'less likely', and 'equally likely'. This helps us guess what might happen next.
Real-World Applications
Guessing if it will rain or be sunny 🌦️
Picking a toy from a big toy box 🧸
Choosing a colored crayon from a pa...
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Key Concepts & Vocabulary
TermDefinitionExample
LikelySomething that will probably happen. It has a good chance. 👍It is likely you will eat lunch today. 🥪
More LikelyWhen one thing has a better chance of happening than another. 🤔In a jar with 7 red gumballs and 2 blue gumballs, picking red is more likely. ❤️
Less LikelyWhen one thing has a smaller chance of happening than another. 🤏In that same jar, picking a blue gumball is less likely. 💙
Equally LikelyWhen two things have the exact same chance of happening. ⚖️Flipping a coin. Landing on heads or tails is equally likely. 🪙
CertainSomething that will definitely happen. It is 100% going to happen! ✅It is certain that the sun will rise in the morning. ☀️
ImpossibleSomething that can never, ever happen. It has a 0% chance. 🚫It is impossible for a pig to fly....
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Core Formulas
The More Likely Rule
Count(A) > Count(B)
If the count of item A is bigger than item B, picking A is more likely.
The Less Likely Rule
Count(A) < Count(B)
If the count of item A is smaller than item B, picking A is less likely.
The Equally Likely Rule
Count(A) = Count(B)
If the count of item A is the same as item B, picking A or B is equally likely.
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Challenging
A spinner is half red and half blue. You spin it 10 times. It lands on red 9 times and blue only 1 time. If you spin it one more time, what is the likelihood of it landing on red or blue?
A.More likely to be red
B.More likely to be blue
C.Equally likely to be red or blue
D.It will not spin
Challenging
I have a bag of 10 blocks. It is MORE likely to pick a red block than a blue block. It is EQUALLY likely to pick a blue block as a green block. Which of these could be the blocks in my bag?
A.4 red, 4 blue, 2 green
B.5 red, 2 blue, 2 green, 1 yellow
C.3 red, 4 blue, 3 green
D.2 red, 3 blue, 3 green, 2 yellow
Challenging
A game has a spinner with three colors: red, yellow, and blue. It is LESS likely to land on red than yellow. It is MORE likely to land on blue than yellow. Which color is the MOST likely to be spun?
A.Red
B.Yellow
C.They are all equally likely
D.Blue
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