Using Open Number Line to Add and Subtract

Using Open Number Lines to

Add and Subtract

Lesson 2

Hundreds Pocket
Chart

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WorkSpace Page 4

Open number line

Addition & Subtraction
Equations

February

7 & 9

Check List

Would you rather…

Quote of the day.

Our Goal Today

Today I will show you
how to use open
number lines to
solve addition and
subtraction
problems.

Key Math Vocabulary in English and Spanish

Add/ Sumar

Addition/Suma

Equation/ Ecuación

Minus/Menos

Equals/ Igual a

Plus/ Más

Subtract/Restar

Subtraction/

Sustracción

Jump/ Salto

Addition Problem

I saved $4.

I saved $3 more.

How much do I have?

4 + 3 = 7

I start at 4 and count on 3, and

land on 7. So the answer is 7

dollars.

Subtraction Problem

I had $7

I spent $3

How much is left?

This time I started at 7 and
count back 3, and I land on 4.

So, the answer is 4 dollars.

This equation is

7 – 3 = 4

Adding with an Open Number Line

● 4 + 3 =

● Watch as I show how to add with an open number

line.

4 7

+3

Adding with an Open Number Line

I start by writing a 4, the first number in the problem. I

make a jump of 3 and write +3 to label the jump. Since 4
+ 3 = 7, I write 7 at the end of the jump.

4 7

+ 3

Subtracting with an
open number line

Watch as I subtract 7 – 3 with an open number
line. I start by writing 7. I make a jump back 3
and write – 3 to label the jump. Since 7 – 3 = 4, I
end up at 4.

4 7

- 3

Your Turn!

8 + 2 = ___

Where do we start? __________
What jump do we make? _______
Where do we end up? ________

Let’s Keep
Going!

Where do we start? __________
What jump do we make? _______
Where do we end up? ________

5 + 4 = ___

Let’s Keep
Going!

Where do we start? __________
What jump do we make? _______
Where do we end up? ________

9 - 4 = ___

What’s Next?

Go to student

WorkSpace page 4.