Addition and Subtraction Equations up to 20

Wow! You've learned a lot of addition and subtraction.

Let's review what you've learned so far.

In **addition,** we combine **addends **to get a **sum.**

In **subtraction,** we subtract a **subtrahend **from a **minuend **to get a **difference.**

**👆 Tip for Remembering:**

When we 'MINUS', the order is:MINUEND -SUBTRAHEND

The minuend is always **before **the subtrahend.

🤓 Let's try adding these numbers.

**14 + 2 = ****?**

As you know, we can add the numbers in many ways. 🤗

👉 We can use **column form.**

👉 We can add **using pictures.**

👉 We can also add using a **number line.**

Nice job! 👏 The **sum is 16.**

14 + 2 =16

Now, let's try subtracting two numbers.

**17 - 4 = ****?**

Again, we can subtract in different ways. 😎

👉 We can use the **column form.**

👉 We can subtract **using pictures.**

👉 We can subtract using a **number line.**

Great work! 😎 The **difference is 13.**

17 - 4 =13

The 3 numbers in an addition or subtraction equation make a group:

👉 The biggest number is called the **whole.**

👉 The other two numbers are its **parts.**

**Adding the parts **gives the whole.

12 + 6=186 + 12=18

**Subtracting one part **from the whole gives the other part.

18- 6=1218- 12=6

🤓 Sometimes, we may have problems like these.

12 +?= 17

15 -?= 11

?- 3 = 10

How can we find these missing numbers? 🤔

We can find **missing numbers **in equations using **whole-and-parts! 🤗 **

👉 Let's look at the first example.

**12 + ****?**** = 17**

Is the missing number** a part or the whole?** 🤔

Since we are **adding,** the missing number is **a part.**

Let's draw a picture to find the answer.

What is the missing part? Count the stars! 👆

😎 That's right! It is **5.**

So, the **missing addend is 5.**

12 +5= 17

👉 Let's try the next example.

**15 - ****?**** = 11**

Here, the second number of a subtraction equation is missing.

🤓 Is the missing number **a part or the whole?**

Great job! 👍 The missing number is **a part.**

Let's draw a picture and find the answer.

What is the missing part?

Nice work! It is **4.**

So, the missing **subtrahend is 4.**

15 -4= 11

👉 Now, let's look at the last problem.

**?**** - 3 = 10**

This time the first number of a subtraction equation is missing.

Is this **the whole or a part?** 🤔

Very good! 😃 This is **the whole,** or the minuend.

The **minuend **is the biggest number in a subtraction equation.

Let us draw a picture to find the answer.

What is the whole?

Count all the stars together! 🙌

Awesome job! It is **13.** 🤗

So, the **missing minuend is 13.**

13- 3 = 10

You did great! 🤗 Now go ahead and try the practice questions.

Teachers:

Create your own self-paced, self-grading lessons.

Try our Lesson Builder tool!Effective, Personalized Learning on Any Device

Give each of your students their own profile with unlimited lessons, practice, and progress tracking.

Teacher Tools

Make your own self-paced, read-assisted, self-grading, mobile-first, adaptive lessons! Access all tools without limits.

Question Bank

View and build off over 2.5k+ lessons and 20k+ smart questions in the growing community library.

Student Analytics

Easily review student progress from the teacher profile.

Easy to Use

Auto-roster with Clever. Designed for both at-school and at-home learning by an ex-Google Product Manager.

Parent

Teacher

Up to 5 students

$39.99 / Year

$6.99 / Month$3.33 / Month

You save $43.89 with the annual plan

7 day free trial