3.1 - Estimate Sums & Differences
Estimate the difference of 388.5-103.2
Possible answers:
400-100=300
390-100=290
7.82+1.07
8.89
856.02-48.12
807.9
5.3-1.7-2
1.6
You have $32.63. You earn $28.42 more washing windows. Then you buy a video game for $35.95. How much money do you have left?
$25.10
Estimate the sum of 27.21+48.73
Possible answers:
27+49=76
30+50=80
562.65+78.04
640.69
3.76-0.53
3.23
14.08+6.15-9.3
10.93
Adult admission to open skate night costs $5.75. Admission for children under 13 costs $1.50 less than the adult admission. What is the total admission cost for two 12-year-olds?
$8.50
One cup of wild rice has 6.5 grams of protein. One cup of shredded chicken has 36.9 more grams of protein than 1 cup of wild rice. About how many grams of protein are in 1 cup of chicken?
Possible answers:
7+37=44 grams
7+40=47 grams
49.87+32.53+2.8
85.2
534.8-28.9
505.9
24.7-5.1+3.75
23.35
Descartes buys a book for $14.99 and a bookmark. He pays with a $20 bill and receives $3.96 in change. How much did the bookmark cost?
$1.05
The speed Earth orbits the Sun is 18.5 miles per second. This speed is 3.3 miles per second slower than the speed Venus orbits the Sun. About how fast does Venus orbit the Sun?
Possible answers:
19+3=22 miles per second
20+3=23 miles per second
A chef needs 3.75 pounds of fish for a dinner party. She catches a fish that is 2.5 pounds and another fish that is 1.75 pounds. Does she catch enough fish for her dinner party?
Yes; She catches 4.25 pounds, which is more than the 3.75 pounds she needed
The average high summer temperature in Death Valley, California, is 46.7 degrees Celsius. The hottest temperature ever recorded is 56.7 degrees Celsius. How much greater is the hottest recorded temperature than the average high temperature?
10 degrees Celsius
You have $35.50. You buy a movie for $15.89 and music for $12.50. How much money do you have left?
Newton pays for a new collar, a bag of dog food, and a box of bones with four $5 bills. The collar costs $7.10. The food costs $5.49. His change is $4.02. How much does the box of bones cost?
$3.39
Estimate 112.18-47.99 using BOTH the rounding strategy and the compatible numbers strategy.
Rounding: 112+48=160
Compatible numbers: 100+50=150 OR 110+50=160
The melting point of aluminum is 403.86 degrees Celsius cooler than the melting point of gold. The melting point of aluminum is 660.32 degrees Celsius. What is the melting point of gold?
1,064.18 degrees Celsius
An athlete's fitness tracker reads 2.69 miles at noon. Their tracker shows 6.34 miles before going to sleep that night. How many miles were recorded after noon?
3.65 miles
A German shepherd weighs 24.75 pounds less than the Bernese mountain dog. The Bernese mountain dog weighs 103.33 pounds. A husky weighs 21.67 pounds less than a German shepherd. How much do the three dogs weigh in all?
238.82 pounds
Your friend buys a scooter for $124.99 and a helmet for $27.50. Your friend has two gift cards that are worth the SAME amount. Your friend uses both gift cards and pays an additional $2.49. What is the amount on each gift card?
$75