Unit 3 - Lesson 15 - Grade 3: Illustrative Mathematics

Kiran and Priya are rounding some numbers and are stuck when trying to round 415 and 750.Kiran said, “415 doesn’t have a nearest multiple of 10, so it can’t be rounded to the nearest ten.”Priya said, “750 doesn’t have a nearest multiple of 100, so it can’t be rounded to the nearest hundred.”Do you agree with Kiran and Priya? Explain your reasoning.

Make a prediction: Whose estimate is going to be greater? Explain your reasoning.

Make two observations about the completed table.

Was your prediction correct?

Round 237 to the nearest ten. Show or explain your reasoning.

Round 237 to the nearest hundred. Show or explain your reasoning.