Addition, Subtraction, Multiplication, and Division Review

In math, there are 4 main **operations: **addition, subtraction, multiplication, and division.

π€ You've done a great job learning about each of them.

In this lesson, let's review what you have learned. π€

Combining two or more numbers is called **addition.**

β
An **addition equation **is made up of two or more addends, the plus symbol (+), the equals symbol (=) and the sum.

Let's try adding some numbers.

4,255 + 3,104 = ?

Let's add the numbers using **column form.**

So, what's the answer? π€

That's right! It is **7,359.**

4,255 + 3,104 =7,359

Great work! π

675 + 198 = ?

Let's add! (Use **regrouping, **if needed.)

What's the sum?

Very good! It is **873.**

675 + 198 =873

Awesome! π

Now, let's move on to subtraction.

Do you remember what subtraction means? π€

**Subtraction **is taking away a part of a number.

β
A **subtraction equation **is made up of the **minuend**, the **subtrahend,** the minus symbol (β), the equals symbol (=) and the **difference.**Let's try subtracting some numbers now.

497 - 251 = ?

Let's subtract the numbers using **column form.**

What's the difference? π€

497 - 251 =246

Nice work! π

7,301 - 6,361 = ?

Let's subtract! Use **regrouping, **if needed.

What difference did you get? π

7,301 - 6,361 =940

Way to go! π€

Let's now review multiplication and division.

Adding equal groups over and over is called **multiplication.**

π For example, when we multiply **2 circles 5 times,** we get 10 circles.

**5 Γ 2 = 10**

β
A **multiplication equation **is made up of the **multiplier**, the **multiplicand**, the multiplication symbol (Γ), the **equals symbol** (=) and the **product**.

The multiplier and multiplicand are also called **factors**.

Let's now look at a few examples.

9 Γ 8 = ?

Let's multiply these numbers using **repeated addition.**

β
We can **add 9 to itself 8 times,** or **add 8 to itself 9 times.**

9 Γ 8 =9+9+9+9+9+9+9+9=72

So,

9 Γ 8 =72

Great work! π

256 Γ 3 = ?

Let's try multiplying these numbers using **column form.**

β
First, we **multiply the digit at the Ones place **by 3.

β
Next, we **multiply the digit at the Tens place **by 3, and add the carry.

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Lastly, we **multiply the digit at the Hundreds place **by 3, and add the carry.

What answer did you get?

256 Γ 3 =768

Nice job! π

Do you remember what division is? π€

That's right!

**Division **is splitting a number into equal groups.

π For example, when we **split 10 circles into 5 equal groups,** we get 2 circles in each group.

**10 Γ· 5 = 2**

β
A **division equation **is made up of the **dividend**, the **divisor**, the division symbol (Γ· or β), and the **quotient.**

Let's now look at some division examples.

30 Γ· 6 = ?

Let's solve this division problem using **repeated subtraction.**

β
We **start at 30 and subtract 6 over and over again,** until we reach 0. The number of times we subtract is our answer.

How many times did you subtract?

Correct! **5 times.**

So,

30 Γ· 6 =5

Perfect! π€

**Tip:** Think about division as the opposite of multiplication. If you see **30 Γ· 6 = ?** just think: what number times 6 equals 30?

**6 x ? = 30**

And you get the same answer: 5!

882 Γ· 7 = ?

Let's solve this question using **long division****.**

β We start by arranging the numbers in the long division form.

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Now, **look at the first digit.**

Can you tell how many 7's will fit into the 8? π€

Very good! **1.**

Write the **1 ****on top,** as the quotient, and write the **product of 1 and 7**** below the 8.**

Now, **subtract this product from the 8 **to get the remainder.

Perfect! π

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Next, **bring down the next digit and repeat **the process.

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Finally, **bring down the last digit and repeat **the process.

What answer did you get?

882 Γ· 7 =126

Great job! π

π You've just reviewed the most important points about addition, subtraction, multiplication and division.Β

Now start your practice below.

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