Mark plans on taking 3 trips this summer. he'll drive 143 miles,138 miles , and 141 miles. estimate the total miles he'll drive. a.140 miles b. 280 miles c.360 miles d.420 miles me.

Lets round each distance to the nearest tens place, and then add them up to get an estimate. 143 rounds down to 140, 138 rounds up to 140, and 141 rounds down to 140. So: 140 + 140 + 140 = 420 miles

Ya i could just need to know what type of math