3 by 2 or 4 by 2
Solve: 105 x 16=
105x 16= 1,680
There are 5,280 feet in 1 mile. How many feet are in 6 miles?
31,680 ft
Estimate the product: 11 x 804
Choose the answer from below:
A. 8,000
B. 8,800
C. 6,000
D. 9,000
11 rounds down to 10 and 804 rounds down to 800
10 x 800 = 8000 (A)
4 or less round down/ let it rest!
Solve: 531 x 62
32,922
Mrs. Garcon has 128 e-books on her phone. Ms. Figueroa has 15 times as many e-books as Mrs. Garcon. How many e-books do they have altogether?
128 x 15= 1,920 e-books
Estimate the product.390×688
Choose the correct answer below.
A. 210,000
B. 280,000
C. 180,000
D. 240,000
390 would round up to 400 and 688 would round up to 700
700 x 400 = 280,000 (B)
Mr. G flies 876 miles round trip. What is the total distance in miles that he would fly for 12 trips?
(Work out using standard algorithm)
10,512 miles
On a family vacation, Ms. Petitt took 1,376 digital photos. Her sister took 4 times as many photos as Ms. Petitt. Find the total number of photos Ms. Petit and her sister took.
1376 x 4 = 5,504 photos
Mrs. Bryan ordered 316 cartons of math books. The books are shipped in cartons that each holds 36 books.
Which equation best estimates the total number of math books in the shipment?
A. 300 × 30 = 9,000 books
B. 300 × 40 = 12,000 books
C. 320 × 30 = 9,600 books
D. 320 × 40 = 12,800 books
D. 320 X 40 = 12,800 books
316 cartons rounds to 320....36 books rounds to 40
5 or more round-up
Solve: 2733 × 34
92,922
Ikea ships 16 cartons to a store. Each carton weighs 245 pounds. What is the total weight of the cartons?
245 x 16 = 3,920
Estimate the product. 47 x 278
Choose the correct answer below.
A. 25,000
B. 20,000
C. 15,000
D. 27, 800
47 would round up to 50 and 278 would round to 300
50 x 300= 15,000 (C)
Find 3,005 × 17=
51,085
5th Graders are playing at a theater that has 528 seats. How many tickets are available for 23 shows?
528x 23 = 12,144
Is 500 an underestimate or overestimate for the product of 12 and 53?
10 x 50= 500
Underestimate because we rounded both numbers DOWN it would be less than the original total.