Previously, students extended their understanding of addition and subtraction within 1,000 and learned how to round to the nearest ten and the nearest hundred. In this lesson, students work with two-step word problems and decide if a given answer for a two-step problem is reasonable. Students estimate answers to two-step problems and determine if each other's solutions make sense after they solve two-step word problems in a way that makes sense to them.

Reflect on students’ assessment. Are they able to flexibly use different strategies, such as considering the answer in context, rounding, or estimating? How can you leverage their previous experiences with sense making and rounding to help them keep reasonableness in mind?