Addition
-8+13
5
-6-9
-15
You flip a coin and roll a six-sided number cube. What is the probability of getting heads and a 5?
1/12
A diver is 18.4 ft below sea level. She rises 7.9 ft. What is her new elevation?
-10.5 ft
A student says 7+(−12)=5. What did they do wrong?
Answer: -5, -12 has the greater absolute value so it needs to be a negative 5
-3/4+5/8
-1/8
6.5-9.2
-2.7
A restaurant lets you choose from 3 entrées, 4 sides, and 2 drinks. How many different meals can you create by choosing one of each?
24 different meals
A hiker begins at an elevation of 6,250.5 ft. She climbs 825.75 ft and then descends 1,040.25 ft. What is her final elevation?
6,036 ft
A student says −4.5−3.2=−1.3. What did they do wrong?
Answer: −7.7 They treated subtraction like finding the difference of the absolute values.
-6.75+(-2.8)+9.4
-0.15
-2/3-5/6
-1 1/2
A bag contains 5 red and 3 blue marbles. You choose one marble without replacing it, then choose another. What is the probability of choosing two blue marbles?
3/8*2/7=3/28
The temperature was -4.5 degrees F in the morning. It increased 7.8 degree then decreased 5.6 degrees. What was the final temperature?
-2.3 degree F
A student solves the following below, find and correct the error.
-3/4+5/8=-2/8
They didn't find a common denominator. Answer =
-1/8
-3 1/4+5 5/6
2 7/12
-2 1/3 - (-1 5/6)
-1/2
There are 7 boys and 5 girls in a group. Two students are randomly selected without replacement. What is the probability that both are girls?
5/12 * 4/11 = 5/33
Jordan owes a friend $18.50. Jordan earns $45.75, pays back the $18.50, and then spends $32.40. What is Jordan's final amount?
-$5.15
A student says that... What mistake did they make?
2 1/4-(-3 1/2)=-1 1/4
Subtracting a negative becomes addition. Answer:
5 3/4
-3 1/4+2.75-(-1 2/3)
1 1/6
4 2/5-(-2.75)+(-3 3/10)
3.85
Three cards are drawn without replacement. What is the probability that all three are face cards?
12/52*11/51*10/50=11/1105
At noon, a submarine was at −184.6 ft. At 1 P.M., it was at −257.9 ft. What was the change in its elevation?
-73.3 ft
Find the error and give the correct answer:
-2.6-(-1 3/4)+5/8=-4.975
They forgot that subtracting a negative becomes addition. Answer:
-0.225