This Problem Set is part of the the Lesson 12, Unit 2, Grade 5. Look back at the divisors in #1i, 1j, and 1k. What did you notice about them? How did the 5 in the ones place affect the way you rounded? In #1l, did anyone leave the divisor unrounded? Is it always necessary to round? Do we follow our typical rounding rules when estimating with division? Why not? How can you justify your answer in #3?