Unit 7 Multiplication

Mental Multiplication Strategies

100

4 x 6 = 24 so 6 x 4 = ?

24

200

7 x 30 = ___ tens

___ tens = _____

so 7 x 30 = ____

21 tens

21 tens = 210

7 x 30 = 210

300

8 x 500 = ____ hundreds

____ hundreds = _______

so 8 x 500 = ______

40 hundreds

40 hundreds = 4,000

so 8 x 500 = 4,000

400

4 x 32 = (4 x __ ones) + (4 x ___ tens)

4 x 32 = ____ ones + ____ tens

4 x 32 = ____ + _____

4 x 32 = _______

(4 x 2 ones) + (4 x 30 tens)

8 ones + 120 tens

8 + 120

128

Multiplication Without Regrouping

100

  30

x  5​​​​

150

200

  42

x  2

84

300

  321

x    3

963

400

  243

x    2

486

Multiplication With Regrouping

100

  25

x  2

 1

 25

x 2

50

200

  49

x  6

  5

  49

x  6

294

 

300

  325

x    3

   1

 325

x   3

 975

400

  456

x    8

  44

  456

x    8

3,648

Word Problems

100

Jaelyn has 43 tricycles. How many wheels do the tricycles have in all?

43 x 3 = 129 wheels

200

There are 4 movie theaters.  Each theater has 249 seats. How many seats are there in all?

249 x 4 = 996 seats

300

Toby and Dominic are raising spiders and ants.  Toby has 28 spiders and Dominic has 132 ants.  How many bug legs are there total?

1,016 legs

400

Aseel, Raini, and Garret were selling cookies for a school fundraiser.  Each box had 8 cookies in it.  Aseel sold 12 boxes, Raini sold 19 boxes, and Garret sold 15 boxes. How many cookies were sold in all?

Bonus:  Each box cost $6.  How much money did they raise?

368 cookies

Bonus: $276