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CLIP 10255

# Checking calculations using the inverse operation

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Key Info
• Checking calculations using the inverse operation
• Duration: 03:09
• The inverse calculation is used to check how many lumps of sugar have been added to a cup of tea. Two cartoon characters are drinking tea. One puts 10 lumps of sugar from a bowl into his cup. He checks how many he has added by counting how many are left in the bowl. He then adds a further 21 lumps to his cup, again checking the number he has put in his tea by counting the lumps left in the bowl.
• Subject:

Topic:

## Calculations: Mixed

• Keywords: checking strategies, counting, inverse operation, addition, subtraction, inverse
Ideas for use in class
• Demonstrates how subtraction sums can be checked using the inverse operation.
Background details
• Clip language : English
• Aspect ratio : 16x9

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