Adding Rational Numbers
What is 3.5+(−1.2)?
2.3
What is 5−9?
−4
4×(−3)?
−12
Compute: -12÷3
-4
Solve: 5+(−2)×3
-1
Find the sum: −8+4
-4
Compute: −3−(−8)
5
Multiply: −6×(−2)
12
What is −16 ÷ -4?
4
Evaluate: 2(−4) + 3
-5
Add: 2/3 + 5/6
1 1/2
Subtract: 7/4−1/2
1 1/4
Multiply: 3/5 × (−10/3)
-2
Divide: 9/10 ÷ 3/5
1 1/2
Compute: 3/4 + (−1/2) × 6
-2 1/4
Maria climbed 39.8 meters up a trail and then continued downhill –14.7 meters to a lookout point. What is the elevation of the lookout point relative to the start of the trail?
25.1 meters
The temperature was –4.5°C in the morning and rose to 2.7°C by noon. What is the change in temperature?
7.2∘C
A scuba tank loses 0.6 pounds of air per minute during a leak. What is the change in air in 8 minutes?
−4.8 pounds
A freezer cools by –18°C over 6 hours. What is the average temperature change per hour?
−3∘C/hr
A hiker walks 2.5 miles, then descends –1.2 miles, then climbs another 0.8 miles. What is the total distance from the start?
2.1 miles
A submarine moves –120.5 meters and later moves back 45.75 meters toward the surface. What is the total change in depth?
−74.75 meters
A diver was at –32.8 feet and descended another 14.6 feet. What is the divers position relative to the surface of the water?
-47.4 ft
A stock value changes by –1.25% each month for 6 months. What is the total percent change?
−7.5%
A car loses –7.2 gallons of gas over 4.5 hours of driving. What is the rate of gas loss per hour?
−1.6 gallons per hour
A bank account increases by $45.60, then has 3 withdrawals of $12.50 each, and finally a fee of $5.75 is applied. What is the net change?
$2.35