ALEX Resources

   View Standards     Standard(s): [MA2019] (3) 8 :

8. Determine and justify solutions for two-step word problems using the four operations and write an equation with a letter standing for the unknown quantity. Determine reasonableness of answers using number sense, context, mental computation, and estimation strategies including rounding.

[MA2019] (3) 10 :

10. Identify the nearest 10 or 100 when rounding whole numbers, using place value understanding.

[MA2019] (3) 11 :

11. Use various strategies to add and subtract fluently within 1000.

This lesson is a hands-on, game-based lesson. It should be part of a larger unit of study on number sense, estimation, and/or place value. The lesson involves students in a game-based activity which gives them a concrete understanding of the relationship between number values, place value, and the accepted mathematical rule for rounding numbers.

This is a College- and Career-Ready Standards showcase lesson plan.

   View Standards     Standard(s): [MA2019] (3) 10 :

10. Identify the nearest 10 or 100 when rounding whole numbers, using place value understanding.

Otto shows the Confalones how to round numbers up or down using spaghetti and meatballs.

   View Standards     Standard(s): [MA2019] (3) 10 :

10. Identify the nearest 10 or 100 when rounding whole numbers, using place value understanding.

Learning to assess the reasonableness of an answer is an important mathematical skill. It’s students' way of seeing if they are on the right track when problem-solving. Sometimes we use rounding to estimate a solution.