JHS1 Mathematics · Term 3 Week 12: Chance or Probability

Lesson notes

Learning Objectives

Indicator: B7.4.2.1.3 - Calculate the probability of the event and express the probability as fractions, decimals, percentages and/or ratios.

By the end of the lesson, learners can:

Calculate the probability of a single event using the formula: Probability = (Number of favourable outcomes) / (Total number of possible outcomes).
Express a given probability as a fraction in its simplest form.
Convert probabilities from fractions to decimals and percentages accurately.
Represent a probability as a ratio, such as 1:2 or 3:5.
Solve simple probability problems involving a single die and complete probability tables.

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Curriculum details

Strand: Handling Data (Strand 4)
Sub-strand: Chance or Probability (4.2)
Content standard: B7.4.2.1 - Identify the sample space for a probability experiment involving single events and express the probabilities of given events as fractions, decimals, percentages and/or ratios to solve problems
Indicator: B7.4.2.1.3 - Calculate the probability of the event and express the probability as fractions, decimals, percentages and/or ratios.
Suggested placement: Term 3, Week 12 (Week 36 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: Mathematics, Common Core Programme (JHS1-JHS3), 2023, p. 88
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1 Calculate the probabilities and complete the table. Name: Score:

Figure from the jhs1 mathematics curriculum, printed page 88

Probability with a single die
The probability of rolling: Fractio Decim Percenta Ratios ns als ges
1. factors of 60 1 1
2. a multiple of 3 3 1
3. factors of 2 3
4. divisors of 12 0.83 2
5. a 3 or greater 3
6. factors of 8 1:2 2
7. factors of 6 3 5
8. divisors of 30 6
9. a 3 or smaller. 50