Multiply by Ten
60 X 20
What is 1,200
Estimate the product 63 X 19
What is 1,200
Find the product using area/box model: 13 X 42
The partial products are 400, 120, 20, and 6. The product is 546.
48 X 38
What is 1,824
At East School, each of the 45 classrooms has an average of 22 students. At West School, each of the 42 classrooms has an average of 23 students. How many more students are at East School than West School?
What is 24 students
10 X 90
What is 900
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
Find the product using area/box model: 15 X 24
The partial products are 200, 100, 40, and 20. The product is 360.
59 X 52
What is 3,068
A zoo gift shop orders 18 boxes of 75 key rings each and 15 boxes of 80 refrigerator magnets each. How many more key rings than refrigerator magnets does the gift shop order?
What is 150 more key rings
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 chairs
Estimate the product of 78 X 21
What is 1,600
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? (Use area/box model)
648 Crayons
91 X 19
What is 1,729
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 more miles
At West School, there are 20 classrooms. Each classroom has 20 students. How many students are at West School?
What is 400 students
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
Solve using area/box model: 16 X 19
The partial products are 100, 40, 60, and 24. The product is 224.
74 X 35
What is 2,590
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 more ball bearings
Kenny bought 20 packs of baseball cards. There are 12 cards in each pack. How many cards did Kenny buy?
What is 240 Cards
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
Solve using area/box model: 23 X 25
The partial products are 400, 100, 60, and 15. The product is 575.
89 X 63
What is 5,607
Mason counted an average of 18 birds at his bird feeder each day for 20 days. Gloria counted an average of 21 birds at her bird feeder each day for 16 days. How many more birds did Mason count at his feeder than Gloria counted at hers?
What is 24 more birds