Luanne estimates the sum of 39 + 15 is about 40 + 15, or 55. Jacob estimates the sum of 39 + 15 is 40 = 20 or 60 which one is closer to the exact sum?
Subtract each estimate from the exact sum to find your answer.
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54
To determine which estimate is closer to the exact sum of 39 + 15, we need to compare the difference between the estimated sums and the exact sum. Let's calculate the differences:
Luanne's estimate: 55 - (39 + 15) = 55 - 54 = 1
Jacob's estimate: 60 - (39 + 15) = 60 - 54 = 6
By comparing the differences, we can see that Luanne's estimate has a difference of 1, while Jacob's estimate has a difference of 6. Since a smaller difference indicates a closer estimate, we can conclude that Luanne's estimate of 55 is closer to the exact sum than Jacob's estimate of 60.