Multiples of 10
30 x 10 =
300
Use rounding to estimate:
12 x 10 =
10 x 10 = 100
Solve this equation any way you choose:
25 x 30 =
25 x 30 = 750
Write an equation and solve:
José loves taking pictures of dolphins. His camera has a memory card that can hold 28 photos. He filed 3 memory cards. How many photos did he take in total?
28 x 3 = 84 photos
40 x 70 =
2,800
Use rounding to estimate:
24 x 18 =
20 x 20 = 400
Draw an area model and solve this problem:
72 x 15 =
72 x 15 = 1,080
Write the equations and solve:
Mildred loves hiking and always hikes 12 miles. If she hiked 15 times last month and 14 times this month, how many miles in total did Mildred hike?
15 + 14 = a; a = 29 times
29 x 12 = m; m = 348 total miles
60 x 20 =
1,200
Use rounding to estimate:
42 x 17 =
40 x 20 = 800
Solve this equation in any way you choose:
43 x 28
43 x 28 = 1,204
Write an equation and solve:
Shelby works 17 hours a week. How many hours will Shelby work in 52 weeks?
17 x 52 = 884 hours
? x 90 = 8,100
90 x 90= 8,100
Use rounding to estimate:
64 x 13 =
60 x 10 = 600
Write an equation for this area model and solve:
83 x 27 = 2,241
A baker makes muffins. He puts 16 muffins in each basket. Which is the best way to use rounding to estimate the number of muffins the baker needs for 23 baskets?
A) 10 x 20 = 200 muffins
B) 20 x 20 = 400 muffins
C) 30 x 20 = 600 muffins
D) 15 x 20 = 300 muffins
B (20 x 20 = 400 muffins)
Select all of the expressions that have a product of 1,600.
A) 20 × 80
B) 20 × 60
C) 40 × 40
D) 60 × 30
E) 90 × 20
A (20 x 80)
C (40 x 40)
Select all of the expressions that could be used to estimate 32 x 14:
A) 30 x 20
B) 30 x 10
C) 14 x 32
D) 40 x 10
E) 32 x 10
B (30 x 10)
E (32 x 10)
Select all of the partial products which would be used to find 19 x 26 =
(Show your work--use an area model if you need to)
A) 45; 60; 180; 200
B) 200; 180; 60; 54
C) 6; 45; 180; 200
D) 200; 60; 180; 54
B (200; 180; 60; 54)
D (200; 60; 180; 54)
Write the equations and solve:
Monty's landscape service charges $68 to plant a tree. What is the total cost to plant 14 trees on Monday and 21 trees on Wednesday?