Find unknowns in grouped calculations
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□ + 4 = 7. Find the missing value.
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Answer: 3
- Undo the operation while keeping both sides equal.
- The missing value is 3. Check it in the original equation.
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Curriculum reference
Victorian Curriculum F–10 Version 2.0
Pi Leo practice scope
Use brackets and inverse operations while preserving equality.
Read the official VCAA curriculum description (VC2M6A02)
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Activities to practise beyond the quiz
- Supported by the guided activity; selecting an MCQ does not demonstrate this action.
- VC2M6A02-C01If a number is multiplied and then increased, reverse the addition first and multiplication second.
- VC2M6A02-C02Brackets mean the enclosed calculation is performed together. Undo the outside multiplication before the addition inside.
- VC2M6A02-C03A proposed solution is correct only if replacing the unknown makes the original equality true.
- VC2M6A02-C04Constructing and explaining a numerical equation strategy.
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Subskills
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Descriptor-derived subskills
- D01Undo operations in reverse orderIf a number is multiplied and then increased, reverse the addition first and multiplication second.
- D02Respect a grouped quantityBrackets mean the enclosed calculation is performed together. Undo the outside multiplication before the addition inside.
- D03Substitute into the original ruleA proposed solution is correct only if replacing the unknown makes the original equality true.