Solve two-step word problems using the four operations. Represent
these problems using equations with a letter standing for the
unknown quantity. Assess the reasonableness of answers using mental
computation and estimation strategies including rounding.
Standard:
Math.3.NBT.1 or 3.NBT.A.1
Description:
Use place value understanding to round whole numbers to the nearest
10 or 100.
3rd Grade Math - Representar problemas en dos pasos Lesson