Integers Introduction — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. A submarine at -250 ft rises 80 ft then dives 60 ft. New depth?
A) -230 ft
B) -310 ft
C) -170 ft
D) -390 ft
-250 plus 80 minus 60 equals -230, the new submarine depth.
2. Monday -7F, Tuesday +5F change, Wednesday -3F change. Wednesday temp?
A) -9F
B) -5F
C) -2F
D) 1F
-7 plus 5 minus 3 equals -5, the temperature reading on Wednesday.
3. Stock: $45 start, -$12, +$8, -$6, +$15 over four days. Final price?
A) $48
B) $54
C) $50
D) $42
45 minus 12 plus 8 minus 6 plus 15 equals 50, the final price.
4. Coldest reading -22F, warmest +18F across cities. Difference equals?
A) 4F
B) -40F
C) -4F
D) 40F
18 minus -22 equals 40, a forty-degree difference between extremes.
Part B: Fill in the Blank
Write the correct answer on each line.
1. Hiker climbs from -50 m to 120 m. Total ascent is 170 m.
120 minus -50 equals 170 meters, the hiker's total climb.
2. Account: $100, -$45, -$70, +$25 leaves balance 10.
100 minus 45 minus 70 plus 25 equals 10, the final balance.
3. Temp changes -2, -5, +9, -4 sum to -2 degrees overall.
-2 minus 5 plus 9 minus 4 equals -2, the overall change.
4. Scores -6, -4, +11, +2 produce a total of 3.
-6 minus 4 plus 11 plus 2 equals 3, the final running total.
5. Difference between 15F and -25F equals 40 F.
15 minus -25 equals 40, a forty-degree temperature gap.