Estimation
Use rounding to estimate 43 x 2
40 x 2 = 80
3 x 70
210
13 x 4
52
11 x 11
121
There are 14 basketballs and 3 times as many soccer balls. How many soccer balls are there?
42 soccer balls
Use rounding to estimate 486 x 4
500 x 4 = 2,000
4 x 300
1,200
254 x 4
1,016
18 x 22
396
There are 586 jolly ranchers in a 5-pound bag. How many jolly ranchers will be in 3 bags?
1,758 jolly ranchers
Use rounding to estimate 7,456 x 6
7,000 x 6 = 42,000
4 x 500
2,000
483 x 6
2,898
65 x 39
2,535
A water park costs $16 per student. How much would it cost to take all 65 4th graders?
$1,040
Use rounding to estimate 33 x 77
30 x 80 = 2,400
50 x 70
3,500
4,372 x 5
21,860
97 x 56
5,432
There are 12 third graders and 14 fourth graders in a pickle club. Each student brings 13 cucumbers for their pickle making project. How many cucumbers do they have in all?
338 cucumbers
Use rounding and compatible numbers to estimate 19 x 26
Rounding 20 x 30 = 600
Compatible numbers 20 x 25 = 500
3,000 x 80,000
240,000,000
97,865 x 3
293,595
143 x 25
3,575
There are 12 fourth graders and 3 times as many fifth graders going on a field trip to the zoo. Each ticket costs $12. How much do they spend on tickets in all?
They spend $576