Question

Mrs. Traynor's class is taking a field trip to the zoo. The trip will cost $26 for each student. There are 22 students in her class. Part A Round each factor to estimate the total cost ofthe students' field trip. Part B Use compatible numbers to estimate the total cost of the field trip.

Answer 1

Part A: 20+30=$60
Part B: 20+25=$45 or you could do 20+30 like part A.

Answer 2

Part A:The total cost can then be estimated as 20 × 30 = $600

Part B: Estimating the total cost with compatible number = 25 × 20 = $500

Explanation:

Part A

Rounding off a number simply means making the number simpler but the rounded value should be close to the actual number. The number could be rounded to the nearest ten, hundred or thousand. The field trip to the zoo involved 22 student and the cost for each student is $26. The question ask to round each factor before estimating the total cost of the student's field trip. The number of student rounded to the nearest ten is 20 and the cost for each student rounded to the nearest ten is $30. The total cost can then be estimated as 20 × 30 = $600

Part B

Part B request we use compatible numbers to estimate the total cost of the field trip. Compatible numbers are numbers that are easy to calculate mentally. This pairs of numbers are easy to add, subtract, divide and multiply mentally. Using compatible numbers the cost can be 25 and the number of student can be 20. Estimating the total cost = 25 × 20 = $500

Note the actual total cost is 26 × 22 = $572