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Probability•
Single Event Probability

Sums to One WORKSHEET

Suitable for Year groups: Year 7, Year 8, Year 9
GCSE Tier: Foundation
Targeting grades: 1-3
Prerequisite knowledge: Fraction, decimal and percentage equivalence, addition and subtraction.
Learning Objective: Use language of mutually exclusive and exhaustive events. using the fact that probabilities sum to 1 to find misisng probabilities.

Sums to One WORKSHEET DESCRIPTION

Students will use the fact that the sum of probabilities for all possible outcomes is one to calculate probabilities of different outcomes and consider mutually exclusive and exhaustive events when working through this worksheet.

In section A, pupils are given the probability of an event occurring and they will list the probability of each event not occurring. Probabilities are given as fractions, decimals and percentages.

Learners are given eight scenarios across sections B and C, they must decide if these scenarios are mutually exclusive and or exhaustive or not.

Section D consists of five further questions that ask students to calculate probabilities of different outcomes.

All worksheets are created by the team of experienced teachers at Cazoom Maths.

Sums to One Worksheet suitable for students in KS3

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Frequently Asked Questions

Students should be comfortable working with fraction, decimal and percentage equivalence, as well as basic addition and subtraction skills. These foundational concepts are essential since the worksheet requires pupils to work with probabilities expressed in all three formats and perform calculations to find missing values that sum to one.