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**Related topic**

Find unknown quantities in number sentences involving addition and subtraction and identify equivalent number sentences involving addition and subtraction (ACMNA083)

- writing number sentences to represent and answer questions such as: ‘When a number is added to 23 the answer is the same as 57 minus 19. What is the number?’
- using partitioning to find unknown quantities in number sentences

Subtraction, Addition, Mathematical expressions