Videos and songs to help Kindergarten kids learn how to use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

Common Core: 1.OA.1 and 1.OA.2

- I can model addition and subtraction word problems using objects, drawings, and equations with unknown numbers in different positions.
- I can solve addition and subtraction word problems using objects, drawings, and equations.
- I can solve word problems with unknown numbers in different positions (e.g., 6 + ? = 8, ? + 2 = 8, 6 + 2 = ?).
- I can represent a problem in multiple ways including drawings and or objects/manipulatives (e.g., counters, unifix cubes, Digi-Blocks, number lines)
- I can take apart and combine numbers in a wide variety of ways
- I can make sense of quantity and be able to compare numbers
- I can use flexible thinking strategies to develop the understanding of the traditional algorithms and their processes
- I can solve a variety of addition and subtraction word problems
- I can use _ or ? to represent an unknown in an equation
- I can model addition and subtraction word problems using objects, drawings, and equations with unknown numbers in different positions.
- I can add three whole numbers whose sum is less than or equal to 20.
- I can solve word problems with three whole numbers using objects, drawings, and equations.
- I can add numbers in any order and be able to identify the most efficient way to solve the problem

Related Topics:

More
Lessons for Grade 1

Common Core for
Grade 1

**Addition Examples:**

**Result Unknown**

Two bunnies sat on the grass. Three more bunnies hopped there.

How many bunnies are on the grass now?

2 + 3 = ?

**Change Unknown**

Two bunnies were sitting on the grass. Some more bunnies hopped
there. Then there
were five bunnies. How many bunnies hopped over to the first?

2 + ? = 5

**Start Unknown**

Some bunnies were sitting on the grass. Three more bunnies
hopped there. Then
there were five bunnies. How many bunnies were on the grass
before?

? + 3 = 5

**Subtraction Examples:
**

Five apples were on the table. I ate two apples.

How many apples are on the table now?

5 – 2 = ?

Five apples were on the table. I ate some apples. Then there were three apples.

How many apples did I eat?

5 – ? = 3

Some apples were on the table. I ate two apples. Then there were three apples.

How many apples were on the table before?

? – 2 = 3

Word Problems. Addition with pictures (up to sum 20)

Lily had 5 apples and her aunt gave her 9 apples later. How many
apples did Lily have finally?

Subtraction by counting back - word problems with pictures

There are 5 books on the desk. Betty took 2 away. How many books are left on the desk?

Word problems - subtraction with pictures - cross out - 1 digit

There are 9 cars in the shop and 8 of them are sold. How many cars are left?

Word problems - Subtraction with pictures - cross out (numbers to 20)

Mary had 11 toys and she gave 5 of them to Emma. How many toys did Mary have finally?

Word problems - adding multiple one-digit numbers

A furniture store sold 6 tables, 2 bookcases and 1 bed. How many pieces of furniture did the store sell in all?

Addition word problems that add up multiple values to sums less than or equal to ten.

1. Laurem gave Troy two yellow pencils, three blue pencils and one green pencil. How many pencils did Lauren give him in all?

2. Ms. Ellis gave Lauren and Troy some cookies. Lauren ate two sugar and two chocolate chip cookies. Troy ate three oatmeal raisin and two sugar cookies. How many cookies did they eat in all?

Subtraction Strategies

This video gives suggestions for solving subtraction story problems using a math mountain, equation, and circle drawing.

I have 8 peanuts. Then I eat 5 of them. How many peanuts are left?

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.

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