Gena wants to estimate the quotient of –21.87 divided by 4.79. Which expression shows the estimate using front-end estimation?
-21 ÷ 4
-21 ÷ 5
-20 ÷ 4
-20 ÷ 5
It is so because I estimated the -21.87 to -21 because of the 8 being higher than five. I estimated the 4 to 5 because of the 7 being higher than five also.