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Multiply by Ten
Estimate Products
Area Model
Multiply With Regrouping
Problem Solving
100
60 X 20
What is 1,200
100
Estimate the product 63 X 19
What is 1,200
100

Find the product using the area model: 13 X 42

The partial products are 400, 120, 20, and 6. The product is 546.

100

48 X 38

What is 1,824

100

Ace Manufacturing ordered 17 boxes with 85 ball bearings each. They also ordered 15 boxes with 90 springs each. How many more ball bearings than springs did they order?

What is 95

200
10 X 90
What is 900
200
What is the best estimate for the product 43 X 68? A: 3,500 B: 2.800 C. 2,400 D: 280
What is B
200

Find the product using the area model: 15 X 24

The partial products are 200, 100, 40, and 20. The product is 360.

200
59 X 52
What is 3,068
200
Elton hiked 16 miles each day on a 12 day hiking trip. Lola hiked 14 miles each day on her 16 day hiking trip. In all, how many more miles did Lola hike than Elton?
What is 32 miles
300
For the school play, 40 rows of chair are set up. There are 22 chairs in each row. How many chairs are there in all?
What is 880
300
Estimate the product of 78 X 21
What is 1,600
300

Each student in Ms. Sike's kindergarten class has a box of crayons. Each box has 36 crayons. If there are 18 students in Ms. Sike's class, how many crayons are there in all? 

648 Crayons

300
91 X 19
What is 1,729
300
Becca rode her bike 16 miles each day for 30 days. Mike rode his bike 25 miles for 28 days. Who rode farther? How much Farther?
What is Mike rode 220 miles farther.
400
At West School, there are 20 classrooms. Each classroom has 20 students. How many students are at West School?
What is 400
400
A half-dollar has a diameter of about 31 millimeters. About how many millimeters long would a row of 56 half-dollars be?
What is about 1,800 millimeters
400

Solve using area model: 16 X 19

The partial products are 100, 40, 60, and 24. The product is 224.

400
36 X 12
What is 432
400
Carol is the treasurer of her bird-watching club. The club wants to order shirts for each of the 18 members. If each shirt costs $21, what is the cost for the members' shirts?
What is #378
500
Kenny bought 20 packs of baseball cards. There are 12 cards in each pack. How many cards did Kenny buy?
What is 240 Cards
500
How could you estimate the product 253 X 93? (Explain and find the estimated product)
I would round 253 to the nearest hundred and round 93 to the nearest ten. 300 X 90 = 27,000
500

Solve using area model: 23 X 25

The partial products are 400, 100, 60, and 15. The product is 575.

500
A toy company makes wooden blocks. A carton holds 85 blocks. How many blocks can 19 cartons hold?
What is 1,615
500
Each of 5 bird-watchers reported seeing 15 roseate spoonbills in a day. If they each reported seeing the same number of roseate spoonbills over 14 days, how many would be reported?
What is 1,050 Roseate Spoonbills