Standard Algorithm
Area Model
Estimating
Word Questions
Bonus
100

15 x 42 =

630

100

Use an area model to solve:

14 x 23 =

322

100

Round to the nearest ten:

13 x 21=

about 200

100
The 4th grade classrooms are having a Holiday's Around the World Potluck. There are 28 students in each class. Each student will eat 11 items. About how many items will be needed to feed all of the classes? 

About 300 items!

100

Use the zero trick to find:

10 x 30 =

300

200

51 x 13 =

663

200

12 x 15 =

180

200

Round to the nearest ten:

36 x 22 =

About 800

200

The train trolley is coming down the train asking students if they want to buy something. 32 students want candies. If all 32 students buy 11 candies, how many candies did they buy in all?  

352 candies!

200

Use the zero trick to find:

18 x 100 =

1800

300

18 x 22 =

396

300

36 x 23 =

828

300

91 x 11 =

About 900

300

Miss Ibbitson is full of holiday cheer, so she decides that everyone will wear pajamas and drink cocoa in class! She buys 31 cups and serves 12 ounces of cocoa to each person. How many ounces of cocoa did she serve? 

372 ounces of cocoa!

300

Choose any method to find:

27 x 23 =

621

400

46 x 12 =

552

400

33 x 22 =

726

400

Round to the nearest ten:


57 x 19 =

About 1,200

400

Mrs. H decides to make reindeer cocoa pouches for all of the students. There are 27 students and each pouch needs 11 marshmallows. About how many marshmallows should she buy?

About 300 marshmallows!

400

Use the zero trick to find:

68 x 10 =

680

500

31 x 21 =

651

500

61 x 12 =

732

500

Round to the nearest ten:


35 x 35 =

About 1600

500
Harry Potter day is coming up in class. The professors decide that everyone can make decorations. 12 students want to make decorations and they make roughly 10 decorations each. Use the zero trick to determine how many decorations were made!

12 x 10 = 120 decorations!

500

Choose any method to find: 


39 x 13 =

507

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