MA19.3.8

Mathematics (2019) Grade(s): 3

MA19.3.8
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.

Unpacked Content

Knowledge

Students know:

Characteristics of addition, subtraction, multiplication, and division.
Strategies for addition, subtraction, multiplication, and division.
Strategies for mental computation and estimating sums, differences, products, and quotients.

Skills

Students are able to:

Use a variety of strategies to solve two-step word problems involving all four operations.
Write an equation to represent the problem context, and use a symbol for the unknown quantity.
Justify strategy and solutions using mathematical vocabulary.
Determine and justify reasonableness of solutions using mental computation strategies and estimation strategies.

Understanding

Students understand that:

Mathematical problems can be solved using a variety of strategies, models, and representations.
Contextual situations represented by multiplication and division.
Reasonableness of solutions can be evaluated by using estimation strategies.

Vocabulary

Unknown quantity
Mental computation
Estimation
Variable
Reasonableness
Rounding
Expression
Equation

Aligned Learning Resources

Roll 'N Round to Win

Solving Two-Step Word Problems

Estimate Sums & Differences of Whole Numbers StudyJam

Determine the Missing Operation in an Equation StudyJam

Estimate Whole Numbers StudyJam

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