Multiplication with Multiples of 10

Vocab

100

Each digit in a number has a ___________.

Hint: ones, tens, or hundreds

place value

200

_____________ of 10 ALWAYS have a 0 in the ones place.

Multiples

300

The numbers being multiplied in an equation are called  _______________.

factors

400

The answer to a multiplication equation is called __________.

The Product

500

An ______________ is a plain line that can be used to help you multiply.

Open Number Line

Using the Distributive Property

100

Using multiples of 10 and the Distributive Property to solve this equation:

5x60=

Some examples include:

5x60= 5x(10+10+10+10+10+10)

5x60=5x(30+30)

5x60= 60+60+60+60+60+60

5x60=300

200

Using multiples of 10 and the Distributive Property to solve this equation:

7x40

Some examples include:

7x40= 40+40+40+40+40+40+40

7x40= 7x(40+40+40+40+40+40+40)

7x40= 7(20+20)

7x40=280

300

Michael is decorating his swimming pool wall that has 6 rows of 30 tiles.

Complete this equation to find the total number of tiles he will need to use:

6 x 30 = _____ x (10+10+____)

6x30= 6x(10+10+10)

6x30=180 tiles

400

Complete this equation to find the product.

3 x 70 = 3 x (__x __)

3 x 70 = (__x __) x 10 

3 x 70 = ____ x 10

3 x 70 = _____

3 x 70 = 3 (7x10)

3 x 70 = (3 x 7) x 10 

3 x 70 = 21 x 10 

3 x 70 = 210

500

Complete this equation to find the total number of tiles he will need to use:

9 x 50  = _____ x (10 +10 + 10 + ___ + ____)

9 x 50 = __________

9 x 50 = 450 

Using the Associative Property

100

Use the Associative Property to write and solve this equation: (remember to use a multiple of 10)

2x40

2x(4x10)

(2x4)x10

2x40=80

200

Use the Associative Property to write and solve this equation: (remember to use a multiple of 10)

60x3

(6x10)x3

6x(10x3)

60x3=180

300

Use the Associative Property to write and solve this equation:

70x5

(7x10)x5

7x(10x5)

70x5=350

400

Use the Associative Property to find 

2x50=

2x50= 2x(5x10)

2x50=(2x5)x10

2x50=100

500

Wanda finds 3x80 by using 3x(8+10). Is she correct? Explain.

No. She should be suing 3x(8x10) which equals 240.

Use Place-Value Strategies with Multiples of 10

100

How many groups of 10 are in 80?

8 tens

200

How many groups of 10 are in 370?

37 tens

300

How many groups of tens are in 420

 42 Tens

400

How many groups of 10 are in 

8 x 80 

64 tens

8x80= 640

500

Sam finds the product of 4x30 and Leah finds the product of 50x4. Sam says his product has a greater number of tens than Leah's. Is he correct? Explain and tell me how many tens each person has.

No he's not correct.

Sam has 12 tens and Leah has 20 tens.

Multiply Multiples of 10 by 1-Digit numbers

100

Solve:

5x30= ___tens

5x30= ____ tens

5x30= _________

5x30= 150

200

Solve:

6x40= ___tens

6x40=  ____ tens

6x40= _______

6x40= 240

300

Draw me an open number line to show 5x30 and solve.

There should be 5 groups of 30. There should be 5 jumps that add 30 every time.

5x30=150

400

Solve

8x30 and 6x40

Do they have the same product?

Yes they both equal 240.

500

Vickie has 10 bags of marbles. Each bag holds 9 marbles. How many marbles does Vickie have?

___ marbles.

90 marbles.