Over/Under
Use rounding (nearest 10) to estimate the product. Is it an over or underestimate?
16 x 37
800 overestimate
Find the product.
3 × 102 = ______
300
Using an area model solve:
612 x 2
612 x 2= 1,224
600 + 10 + 2 x 2
600 x 2 = 1200
10 x 2 = 20
2 x 2 = 4
38 x 12 =
456
A local food bank collected 12,000 pounds of turkey to donate for Thanksgiving. They plan to divide the donations equally among 3 shelters. How many pounds of turkey will each shelter receive?
Equation: 12,000 ÷ 3 =
Each shelter receives 4,000 pounds.
Use rounding (nearest 10) to estimate the product. Is it an over or underestimate?
21 x 24
400 underestimate
Find the product.
20 x 103 =
20,000
Use an area model to solve.
2,624 x 5
2,624 x 5 = 13120
2,000+600+20+4
2,000 x 5 = 10000
600 x 5 = 3000
20 x 5 = 100
4 x 5 = 20
Find the product. Check if your answer is reasonable.
782 x 66=
780 x 65 = 50,700
51,612
You are having a bake sale. You sell 36 cupcakes for $4 each. How much money did you make on the cupcakes?
$144
Use compatible numbers to estimate the product. Is it an over or underestimate?
43 x 51 =
45 x 50 = 2,250 overestimate
Find the missing factor.
___ x 102 = 6,000
60
Find the product check if your answer is reasonable.
16,383
x 4
~64,000
65,532
1,420 x 202 =
286,840
You're going on vacation, you and your family travel 3,146 miles on day 1 and day 2 (what a coincidence!). Then travel 3,000 miles on day 3, 4, and 5. How many miles did you travel after 5 days.
6292 (day 1 and 2) + 9000 (days 3-5) = 15,292 miles over 5 days
Use compatible numbers to estimate the product. Is it an over or underestimate?
38 x 36
40 x 35 = 1400
overestimate
Find the missing factor
20 x ____ = 14,000
700
Find the product. Check whether your answer is reasonable.
51,423
x 8
411,384
50000 x 8 = 400,000
Find the product. Check whether your answer is reasonable
808 x 888 =
800 x 900 = 720,000
717,504
A store sells 145 turkey dinners on Thursday. Each dinner costs $65. How much money did they make on Thursday?
$9,425
Estimate the product.
82 x 304 =
80 x 300 = 24,000
Find the missing factor.
____ x 103 = 345,000
345
How many times do you need to regroup when Solving
14,364 x 7
Show work!!
regroup 4 times
18,056 x 405
(it's a challenge)
7,312,680
During the Thanksgiving Day Parade, volunteers help guide the giant character balloons down the parade route. Each giant balloon requires 24 volunteers, and there are 16 different character balloons in the parade this year.
How many volunteers are needed in total to guide all of the big parade balloons?
24 × 16 = 384 volunteers