Videos and lessons to help Grade 3 students learn to 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.

Common Core: 3.OA.8

- I can choose the correct operation to perform the first computation, and choose the correct operation to perform the second computation in order to solve two-step word problems.
- I can write equations using a letter for the unknown number.
- I can decide if my answers are reasonable using mental math and estimation strategies including rounding.

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More Lessons for Grade 3

Common Core for Grade 3

Solving two step word problems, including those with unknown quantities--1 of 5 (CCSS: 3.OA.8)

In this lesson you will learn to identify the operations in two step word problems by using problem solving steps and a bar model.

Example: Jack has 28 lollipops. Jill has 12 fewer. How many lollipops do they have altogether?

Solving two step word problems, including those with unknown quantities--2 of 5

In this lesson you will learn to solve multi-step problems by understanding the use of parentheses.

Example: Lindsay has 3 sticks of gum. She buys 2 more packets with 5 in each. How many sticks of gum does she have?

Solving two step word problems, including those with unknown quantities--3 of 5

In this lesson you will learn to solve two step story problems by using letters to represent unknown quantities in equations.

Example:

a) Jack has 28 lollipops. Jill has 12 fewer. How many lollipops do they have in all?

b) Zach wants to ride his bike 50 miles. He rides 5 miles each day. After 7 days, how many miles does he have left?

Solving two step word problems, including those with unknown quantities--4 of 5

In this lesson, you will learn to estimate solutions to multi-step story problems by rounding.

During the soda can drive, second grade collect 372 cans. Third grade collect 436 cans. 18 cans were squished and cannot be used. About how many cans did they collect?

Solving two step word problems, including those with unknown quantities--5 of 5

In this lesson you will learn to check if your answers to story problems are reasonable by using front end estimation.

Solve two-step word problems using equations with a letter standing for the unknown quantity.This video illustrates how students can learn to represent word problems using a letter to stand for the unknown (Common Core Standard 3.0A.8).

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.