   ## Sums to One worksheet

Suitable for Year groups: 7, 8, 9
GCSE Tier:
Foundation
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Prerequisite knowledge: Fraction, decimal and percentage equivalence, addition and subtraction.
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## 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.

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