If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.
You already know Dokkio is an AI-powered assistant to organize & manage your digital files & messages. Very soon, Dokkio will support Outlook as well as One Drive. Check it out today!

2-N-1-5

Page history last edited by Tashe Harris 6 years, 2 months ago

2.N.1.5 Recognize when to round numbers to the nearest 10 and 100.

In a Nutshell

Students enter second grade with a basic understanding of place value up to 100. As students expand their knowledge of place value to include whole numbers up to 1,000, they will learn when to round numbers up or down to the nearest 10 and 100. This concept will continue in third grade as students recognize when to round to the nearest thousand and ten thousand, using compatible numbers to estimate sums and differences.

Student Actions	Teacher Actions
Develop the ability to generalize patterns for rounding to the nearest 10 and 100. Develop conceptual understanding of rounding by making real-world connections ( e.g., A can of green beans priced at 79 cents is about 80 cents) Develop mathematical reasoning with a variety of strategies to round to the nearest 10 and 100. Develop a deep and flexible conceptual understanding of the base ten number system related to proximity and value (e.g., 130 is closer to 100 than 200 because it is 3 tens away from 100 and 7 tens away from 200).	Pose purposeful questions to advance students’ reasoning and sense-making about rounding. Implement tasks where students grapple with real-world problems in which they must round to the nearest 10 or 100. Elicit and use evidence of student thinking on rounding problems to assess progress toward understanding.
Key Understandings	Misconceptions
Relationship between numbers in terms of proximity to the next group of ten/hundred or the previous group of ten/hundred. Recognize when to round in real world situations. For example, if gum is sold in packs of 10 sticks and there are 24 students in second grade, the teacher will need to buy 30 sticks of gum (3 packs) in order for each student to have gum.	Rounding a number means to the next number up or down rather than to a benchmark number. For example, 37 rounds to 36 or 38.