Estimating Products
362 x 47
20,000
152 x 9
1,368
Erin ran 18 mi. this week. She ran twice as many miles in her neighborhood as on the track at school. How many miles did she run in her neighborhood?
12 miles
Give a high and low estimate for 30.1 x 11
300-620
300-341
List the first 10 multiples of 5 and 2.
5, 10, 15, 20, 25, 30, 35, 40, 45, 50
2, 4, 6, 8, 10, 12, 14, 16, 18, 20
805 x 8
8,000
72 x 35
2,520
Marco spent $48 on books and stationery. If he spent 3 times as much on books as on stationery, how much did he spend on stationery?
$12
Give a high and low estimate for 32.1 x 12
300-600
384-396
What is the LCM of 2 and 5?
10
30.1 x 5.3
150
24.7 x 0.003
0.0741
The difference between the prices of 2 bikes is $18. The sum of their prices is $258. How much does the less expensive bike cost?
$120
Give a high and low estimate for 45.7 x 13
400-1,000
585-598
List the first 10 multiples of 4 and 9.
4, 8, 12, 16, 20, 24, 28, 32, 36, 40
9, 18, 27, 36, 45, 54, 63, 72, 81, 90
62.7 x 2.8
189
2.56 x 0.34
0.8704
In a 72-mi bike relay, each rider will ride either 8 mi or 4 mi. The same number of riders will ride each distance. How many riders will ride each distance?
6 riders
(6 x 8) + (6 x 4) = 72
Give a high and low estimate for 45.2 x 43.8
1600-2500
1935-2024
What is the LCM of 6 and 8?
24
35.2 x 5.4
175
7.31 x 0.08
0.5848
Jacqueline Cochran became the first woman to fly faster than the speed of sound. Sound travels at 0.21 mi/sec. About how many miles per hour did she need to fly to break the sound barrier? (Hint: There are 3,600 seconds in 1 hour)
more than 756 mi/hr
Give a high and low estimate for 22.3 x 15.6
200-600
330-368
What is the LCM of 7 and 9?
63