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Question
Use counters to add 3 + -5.
You start with:
You add:
Which picture shows the sum?
Use counters to add 3 + -5.
You start with:
You add:
Which picture shows the sum?
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Solution
The correct option is B
Pairs made up of a positive counter and a negative counter have a value of zero.
You are trying to calculate 3 + -5.
Start with 3 positive counters
Now add 5 negative counters:
Since pairs made up of a positive counter and a negative counter have a value of zero, cross them out.
2 negative counter remains:
∴3+−5=−2
Pairs made up of a positive counter and a negative counter have a value of zero.
You are trying to calculate 3 + -5.
Start with 3 positive counters
Now add 5 negative counters:
Since pairs made up of a positive counter and a negative counter have a value of zero, cross them out.
2 negative counter remains:
∴3+−5=−2Suggest Corrections
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