2. To estimate $4.80 + $2.25 + $3.40, Gail rounded up and down and used $5 + $2 + $3 = $10. Gails mother rounded up and used $5 + $3 + $4 = $12. What are some advantages of doing estimation the second

2. To estimate $4.80 + $2.25 + $3.40, Gail rounded up and down and used $5 + $2 + $3 = $10. Gails

mother rounded up and used $5 + $3 + $4 = $12. What are some advantages of doing estimation the
second way?

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