Add positive and negative whole numbers

Answer Key - Grade 7 Math Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   Ren's math club challenge has four numbers and one sneaky shortcut. What is (-38) + 52 + 38 + (-19)?

   33
2. 2.

   In a robot video game, Zee scores -44, -15, 44 and 37 points in four levels. Trap levels cost points. What is Zee's total score?

   22
3. 3.

   Bo fills in a balance puzzle: (-23) + 9 + ? = 0. What is the missing number?

   14
4. 4.

   Esme's puzzle card says 31 + (-48) + ? = 0, with a smiley face for luck. What is the missing number?

   17
5. 5.

   Jun writes (-17) + (-26) + ? = 0 on the board and dares the class to solve it. What is the missing number?

   43
6. 6.

   Kira's kite rises 42 meters, then sinks 19 meters. What change in height, as a positive or negative number, brings the kite back down to the ground?

   -23
7. 7.

   From the trailhead, Luz climbs 36 meters, then goes down 50 meters to a creek. What change in height takes Luz back up to the trailhead?

   14
8. 8.

   At dawn, Milo's thermometer read -16°F. It rose 24 degrees by 3 p.m., fell 13 by 9 p.m., then fell 6 more by midnight. What was the temperature at midnight?

   -11
9. 9.

   At 8 p.m. it was -9°F at Tala's campsite. By midnight it fell 7 degrees, by 3 a.m. 5 more, and by 6 a.m. 3 more. What was the temperature then?

   -24
10. 10.

    Ari's kite is 15 m up. It climbs 18 m, then drops 18 m, so the total change in height is 0. What does the 0 mean?

    • The kite is 36 m higher than at the start, after both changes
    • The kite is on the ground.
    • The kite never moved at all.
    • The kite is back at 15 m, where it started.