Question

Estimate then add to find the combined length of the four highways shown in the table.is your answer resonable? Explain. Interstate 1-90 length 3,102 , 1-10 length 2,460, 1-70 lenght 2,153, 1-80 length 2,899

Answer 1

To estimate, round 3102 to 3100
round 1-10 to 2500
1-70 to 2100 
1-80 to 2900
2900+2100+2500+3100=10600mi
Yes it is reasonable because you add and subtract numbers when estimating, however it is not exact