Maths
Checking with the Inverse
Use inverse operations to check answers to additions and subtractions with three-digit numbers.
MathsAge 9+25 minutes
What this topic covers
- Check a column addition with a column subtraction.
- Check a column subtraction with a column addition.
- Use the inverse to find a missing number in a three-digit calculation.
Core concept summaries
Key ConceptsFlip It BackChecking Column WorkWhen the Check Fails
Practice formats pupils may meet
NeurofiED uses varied practice to help pupils apply the idea actively, check understanding and build confidence over time.
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