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Adding and subtracting

Skip counting Decimals Place valueHere you will learn about multiplication and division, including strategies on how to multiply and divide various types of rational numbers.

Students first learn about multiplication and division in the 3 rd grade and 4th grade with their work with operations and algebraic thinking, as well as number and operations base ten and fractions.

**Multiplication and division** are two of the four basic operations. Multiplication is finding the product of two or more numbers, and division is finding the quotient of two numbers.

**Multiplication** is basically the repeated addition of equal groups.

For example, 4 equal groups of 3 :

In a multiplication equation, the answer to multiplying one number by another is called the product. The multiplicand is the quantity to be multiplied by the multiplier, which will give you a product.

The **product** will be 0 if either the multiplicand or multiplier is 0 .

Arrays are visual models that represent multiplication.

For example, this array shows 3 rows of 6 which is the same as 3 \times 6 .

3 \times 6=18

**Step by step guide: **Understanding Multiplication

Multiplication is commutative. The order in which the calculation is performed does not matter.

For example,

3\times{4}=4\times{3}=12

To multiply multi-digit numbers, you can use the algorithm or the area model.

The area model is a rectangular model where the product represents finding the area of the rectangle.

For example, multiply 42 \times 62 using an area model.

2400+120+80+4=2604

42 \times 62=2604

**Step-by-step guide:** Multiplying multi-digit numbers

You can use multiplication to make comparisons between quantities. Multiplicative comparisons compare two quantities by showing that one quantity is how many times larger or smaller than another quantity.

For example,

Mike has 3 lollipops. Michelle has 4 times as many lollipops as Mike. How many lollipops does Michelle have?

Michelle has 4\times 3=12 lollipops.

Jillian has 24 inches of hair ribbon. Suzanne has half that amount. How long is Suzanne’s hair ribbon?

Suzanne’s ribbon is \cfrac{1}{2} \times 24=12 \text { inches }

**Step by step guide:** Multiplicative comparisons

You can multiply rational numbers. Rational numbers include multi-digit numbers, integers, fractions, and decimals. When multiplying positive and negative numbers, the following rules apply:

For example, (-3) \times(-5)=15

**Step by step guide:** Multiplying and dividing integers

**Division** shares or breaks a number into equal sized groups.

For example, the number 12 can be divided into 4 equal groups of 3 .

In a division equation, the answer you get when you divide one number by another is called the quotient.

The word quotient comes from Latin and means ‘how many times.’ When dividing, you are finding out ‘how many times’ a number goes into another number.

For example,

The **quotient **will only be 0 if the **dividend **is 0 but the **divisor **is not.

For example,

0 \div 8=0

8 \div 0=\text {Does not exist }

**Step by step guide:** Understanding division

Unlike multiplication, division is not commutative. If the order of the numbers within the calculation changes, the result will change.

12 \div 4

To solve division problems with larger numbers, you can use long division.

For example, 452.1 \div 3

**Step-by-step** **guide:** Long division

**Step by step guide:** Dividing multi-digit numbers

Division can also be done with positive and negative integers, fractions, and decimals. When dividing positive and negative numbers, the following rules apply:

For example, (-20) \div (-5)=4

**Step by step guide:** Multiplying and dividing integers

**Step by step guide:** Multiplying and dividing rational numbers

How does this relate to 4 th – 7 th grade math?

Interpret products of whole numbers, for example, interpret 5 × 7 as the total number of objects in 5 groups of 7 objects each.**Grade 3: Operations and Algebraic Thinking ( 3.OA.A.1)**

**Grade 3: Operations and Algebraic Thinking (3.OA.A.2)**Interpret whole-number quotients of whole numbers, for example, interpret 56 \div 8 as the number of objects in each share when 56 objects are partitioned equally into 8 shares, or as a number of shares when 56 objects are partitioned into equal shares of 8 objects each.

**Grade 3: Operations and Algebraic Thinking (3.OA.C.7)**Fluently multiply and divide within 100 , using strategies such as the relationship between multiplication and division.

**Grade 4: Operations and Algebraic Thinking (4.OA.2)**Multiply or divide to solve word problems involving multiplicative comparison, for example, by using drawings and equations with a symbol for the unknown number to represent the problem, distinguishing multiplicative comparison from additive comparison.

**Grade 4: Number and Operations – Fractions (4.NF.B.4)**Apply and extend previous understandings of multiplication to multiply a fraction by a whole number.

**Grade 5: Number and Operations Base Ten (5.NBT.B.5)**Fluently multiply multi-digit whole numbers using the standard algorithm.

**Grade 5: Number and Operations – Fractions (5.NF.B.7)**Apply and extend previous understandings of division to divide unit fractions by whole numbers and whole numbers by unit fractions.

**Grade 6: Number System (6.NS.C.6)**Understand a rational number as a point on the number line. Extend number line diagrams and coordinate axes familiar from previous grades to represent points on the line and in the plane with negative number coordinates.

**Grade 7: Number System (7.NS.A.2)**Apply and extend previous understandings of multiplication and division and of fractions to multiply and divide rational numbers.

There are several strategies to multiply and divide numbers. For more specific step-by-step guides, check out the individual pages linked in the “What is multiplication and division?” section above or read through the examples below.

In order to multiply using a visual model:

**Draw the array.****Count the objects in each row.****Find the total**.

In order to divide using a visual model:

**Draw the array.****Count the objects in each group.****Write the answer**.

In order to multiply and divide multi-digit numbers:

**Perform the multiplication or division algorithm.****Write the answer.**

In order to find multiplicative comparisons:

**Draw a model.****Write an equation.****Solve the equation and label the answer.**

Assess math progress for the end of grade 4 and grade 5 or prepare for state assessments with these mixed topic, multiple choice questions and extended response questions!

DOWNLOAD FREEAssess math progress for the end of grade 4 and grade 5 or prepare for state assessments with these mixed topic, multiple choice questions and extended response questions!

DOWNLOAD FREEUse a visual model to multiply 5 \times 3.

**Draw the array.**

5 x 3 is 5 rows of 3.

2**Count the objects in each row.**

3**Find the total**.

There are 3 chips in each row, 3+3+3+3+3=15

3 \times 5=15

Multiply 99 \times 7.

**Perform the multiplication or division algorithm.**

Using the algorithm,

**Write the answer.**

99 \times 7=693

Multiply 1.23 \times 3.2.

**Perform the multiplication or division algorithm.**

**Write the answer.**

1.23 \times 3.2=3.936

Divide: 9 \div 3

**Draw the array.**

**Count the objects in each group.**

**Write the answer.**

9 \div 3=3

Divide: 15.4 \div 2

**Perform the multiplication or division algorithm.**

**Write the answer.**

15.4 \div 2=7.7

Bobby has 3 baseball cards. Joey has five times as many cards as Bobby. How many cards does Joey have?

**Draw a model.**

**Write an equation.**

3 \times 5= \, ?

**Solve the equation and label the answer.**

3 \times 5=15

Joey has 15 baseball cards.

- Use manipulatives to reinforce the conceptual understanding of multiplication and division.

- Include real world scenarios so that students can connect the mathematical concepts to the world around them.

- Reinforce to students that the concept of multiplication and division is the same regardless if the numbers are whole numbers or rational numbers.

- Using the area model for multiplication and division can be a fun way for students to understand multiplication and division while also reinforcing math facts.

- To practice multiplication facts, consider using digital and non-digital games instead of flashcards. Game playing is a fun way for students to remember the times tables.

**Confusing the rules for multiplying and dividing positive and negative numbers**

For example, multiplying (-4)\times (-8) and getting a product of -32 instead of 32 .

**Misinterpreting the meaning of key words in word problems resulting in using the incorrect operation**

For example, thinking that the word “of” means to divide instead of multiply.

**Confusing place value when using the area model for multiplying multi-digit numbers**For example, when multiplying 23 \times 41 :

1) Which multiplication expression represents this array?

2 \times 5

6 \times 2

5 \times 3

2 \times 6

Count the number of objects in each row.

There are 5 objects in each row which is 5+5.

5+5 is the same as 2 \times 5.

So, 2 \times 5 is the correct expression.

2) Multiply 104 \times 3.

302

321

320

312

Use the algorithm for multiplying multi-digit numbers, regrouping when necessary.

104 \times 3=312

3) Multiply 53 \times 32.

1669

1696

1690

1596

You can use the area model to multiply 53 \times 32.

Add the products together: 1500+100+90+6=1696

53 \times 32=1696

4) Use the array to find the quotient of 16 \div 4 .

8

4

16

6

Divide the array into 4 equal groups and then count how many objects are in each group.

16 \div 4 = 4

5) Divide 128 \div 4.

23

132

32

123

Divide the numbers using the algorithm for long division.

128 \div 4= 32

6) Chris has 3 pencils. Pam has four times as many pencils as Chris. How many pencils does Pam have?

11 pencils

10 pencils

12 pencils

7 pencils

Draw a picture.

4 \times 3=12

Pam has 12 pencils.

Yes, the rules for multiplying and dividing positive and negative numbers hold true regardless if the numbers are whole numbers or rational numbers.

Knowing your multiplication facts and division facts helps when solving problems.

Repeated subtraction is a way for students to begin to develop an understanding of division.

There is not one best strategy to use when multiplying multi-digit numbers. Some strategies, can be quicker than others, but not better.

Knowing your multiplication tables helps to answer questions faster than when you do not know them.

The commutative property of multiplication is: 5 \times 3=3 \times 5 , the order of the numbers does not matter.

- Types of numbers
- Rounding numbers
- Factors and multiples
- Multiplication and division within 100

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