Videos, examples, solutions, and lessons to help Grade 2 students learn how to use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

**Related Pages**

Lesson Plans and Worksheets for Grade 2

Lesson Plans and Worksheets for all Grades

More Lessons for Grade 2

Common Core For Grade 2

Common Core: 2.OA.1

- I can choose when to use addition and/or subtraction in a word problem
- I can represent addition and subtraction word problems using objects, drawings, and equations with unknowns in all positions.
- I can solve addition and subtraction word problems that involve two steps (doing one computation, and using that answer to perform a second computation that leads to the solution of the problem).
- I can solve word problems with unknown numbers in different positions (e.g., 5 + ? = 13, ? + 8 = 12)
- I can explore addition and subtraction with manipulatives (e.g., snap cubes, subitizing cards, tens frames, hundreds charts, number lines and empty number lines)
- I can take apart and combine numbers in a wide variety of ways
- I can use >, =, and < when comparing quantities
- I can use different thinking strategies to develop the understanding of the traditional algorithms and their processes
- I can apply properties of addition and subtraction
- I can choose the most efficient strategy to solve a problem
- I can solve various types of addition and subtraction word problems
- I can use _ or ? to represent an unknown in an equation

**Take Apart and Combine Numbers**

**Total Unknown**

Three red apples and two green apples are on the table. How many apples are on the table?

3 + 2 = ?

**Addend Unknown**

Five apples are on the table. Three are red and the rest are green. How many apples are green?

3 + ? = 5, 5 − 3 = ?

**Both Addends Unknown**

Jenny has five flowers. How many can she put in her red vase and how many in her blue vase?

5 = 0 + 5, 5 = 5 + 0

5 = 1 + 4, 5 = 4 + 1

5 = 2 + 3, 5 = 3 + 2

**Compare Word Problems**

**Difference Unknown**

(How many more?):

Jane has two oranges. Mary has five oranges. How many more oranges does Mary have than Jane?

2 + ? = 5

(How many fewer?):

Jane has two oranges. Mary has five oranges. How many fewer oranges does Jane have than Mary?

5 − 2 = ?

**Smaller Unknown**

(Version with more):

Mary has three more oranges than Jane. Jane has two oranges. How many oranges does Mary have?

2 + 3 = ?

(Version with fewer):

Jane has 3 fewer oranges than Mary. Jane has two oranges. How many oranges does Mary have?

3 + 2 = ?

**Bigger Unknown**

(Version with more):

Mary has three more oranges than Jane. Mary has five oranges. How many oranges does Jane have?

5 + 3 = ?

(Version with fewer):

Jane has 3 fewer oranges than Mary. Mary has five oranges. How many oranges does Jane have?

? + 3 = 5

**One-Step Word Problems 1 - Bar Model (Part-Whole)**

An effective model always has a visual model of the problem, a number sentence, and the answer to the question in a complete sentence.

Example:

Mr. Oliver had 88 pencils. He sold 27 of them. How many pencils did he have left?

**Word Problems 2 - Bar Model (Part-Whole)**

This video employs a visual way to solve world problems using bar modeling. This type of word problem uses the part-whole model. Because the part is missing, this is a subtraction problem.

Example:

There are 98 hats. 20 of them are pink and the rest are yellow. How many yellow hats are there?

**Word Problems 3 - Bar Model (Part-Whole)**

This video employs a visual way to solve world problems using bar modeling. This type of word problem uses the part-whole model. Because the whole is missing, this is an addition problem.

Example:

Mr. Gray sold 54 drinks in the morning. Mr. Frank sold 25 drinks at night. How many drinks did they sll altogether?

** Part-whole Word Problem**

This video shows you how to solve a word problem using bar models. This technique is one of the strategies that can be used to address Common Core math standard 2.OA.1.

Example:

Maya had some stamps. She gave 7 stamps to her younger brothers. Maya then had 14 stamps. How many stamps did Maya have at first?.

**Comparison Word Problem**

This video explains how to use bar modeling in Singapore math to solve word problems that deal with comparing. Example:

Example:

Adam has 11 fewer lollipops than Hope. If Adam has 16 lollipops, how may lollipops does Hope have?

**Bar Model (Comparison)**

This video employs a visual way to solve world problems using bar modeling. This type of word problem uses the comparison model. Because the part is missing, this is a subtraction problem.¦nbsp;

Example:

Cayla did 88 sit-ups in the morning. Nekira did 32 sit-ups at night. How many more sit-ups did Cayla do than Nekira?

**Two-Step word problems**

This video shows you how to solve two-step word problems using bar models.

Example:

50 children attended the birthday party. 13 children left during the first hour. 9 children came in during the second hour. How many children were at the birtday party then?

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