Don't cry, multiply
Dividing Gravity
It's all Mental (No Whiteboards!)
Areas, perimeters, and all that
Potpourri
100

7x9

63

100

52 divided by 4

12

100

6x12

72

100

What is the perimeter of a room that has a length of 20 inches and a width of 5 inches

50 inches. It's a turtle tank!

100

4 × ______ = 400

100

200

12x5

60

200

79 divided by 6

13 remainder 1

200

360 divided by 6

60

200

What is the area of a piece of paper with a width of 7 inches and a length of 12 inches

84 inches
200

345+ 999

1,344

300

78x8

624

300

995 divided by 5

199

300

21,323 x 3

63,969

300

Mr. Taylor needs to plant flowers in his garden. If he needs 9 flowers to fill the width and 54 flowers to fill the length, how many flowers does he need to plant in all?

486

300

The aquarium has 30 times as many fish in one tank as Jacob has. The aquarium has 90 fish. How many fish does Jacob have?

Jacob has 3 fish.

400

321x3

963

400

Benjamin Button has 6 times as many muffins as his cousin, but his cousin thinks he's bluffin so he pulls out 258 muffins. How many muffins does Benjamin Button's cousin have?

Benjamin Button's cousin has 43 muffins

400

Santa Claus has 6 batteries. Ms. Robin has 300 times as many batteries. How many does Ms. Robin have?

She has 1800 batteries together.

400

Solve the following expressions using the standard algorithm, the partial products method, and the area model.


4 2 5 × 4

1700 (show methods)

400

A restaurant sells 1,725 pounds of spaghetti and 925 pounds of linguini every month. After 9 months, how many pounds of pasta does the restaurant sell?

2650x9=23,850

500

455x7

3,285

500

Mr. Tarzy's lawn has an area of 1,755 meters. The width of his lawn is 9 meters. 

a. What is the length?

b. How much fence does he need to go around if he wants to keep his neighbor Ms. Robin away?

a. 195 feet

b. 3,528 feet

500

50x30 then divide that by 5

300

500

Santa needs a new factory in the North Pole. He wants to have at least 9,000 square feet to make his toys. He wants his width to be 80 feet. What must be his length be (at least)?

113 feet

500

2. There are twice as many cows as goats on a farm. All the cows and goats have a total of 1,116 legs.

How many goats and cows are there total?

Bonus: How many goats are there?

There are 279 goats and cows.

There are 93 goats. 

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