This Instructional Activity is a part of the Lesson 12, Unit 2, Grade 6. Students should be seeing a pattern. The closer the divisor is to a multiple of 10, the more accurate the estimation of the quotient. In Exercises 1 and 3, students had divisors that were one number away from a multiple of and their estimates of the quotients were very accurate. In Exercises 2 and 4, students were a bit further away from a multiple of 10.