I'll do the first one to get you started.
Round 4.7 to the nearest whole number to get 5. Do the same to -3.3 leading to -3
The question "what is the distance between 4.7 and -3.3?" is roughly the same as "what is the distance from 5 to -3?" after we do those two estimations.
Plot 5 and -3 on the number line. Count out the number of spaces between the two values. You should count out 8 spaces. In terms of subtraction, we have
5 minus (-3) = 5 - (-3) = 5 + 3 = 8
The two negatives cancel to make a positive.
Therefore, it is reasonable to estimate the distance between 4.7 and -3.3 is roughly 8 units
