[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.