Multi-step problems with positive and negative numbers, and checking they make sense

Answer Key - Grade 7 Math Worksheet

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

1. 1.

   A whale Jun watches from a boat starts at -12.25 m (below the surface is negative). It rises 1/2 m each second for 9 seconds. Where is the whale then?

   -7.75
2. 2.

   Luz hikes from 1.5 m above the trailhead. The trail descends 3/4 m each minute for 5 minutes. What is Luz's height above the trailhead then?

   -2.25
3. 3.

   A table of four rows. Row | Change: 1 | -3/4; 2 | 1.5; 3 | -0.25; 4 | -2. Milo keeps a table of how a pond's water level changed on four days, in cm. What is the total change?

   -1.5
4. 4.

   A table of four rows. Row | Change: 1 | 1.75; 2 | -2; 3 | -3/4; 4 | -1.5. Ren keeps a table of how a harbor's water level changed on four mornings, in cm. What is the total change?

   -2.5
5. 5.

   Tala has a 2.75 m piece of yarn and cuts 3 pieces that are 3/4 m each. How many meters of yarn are left?

   0.5
6. 6.

   Ari has 3.25 liters of juice and fills 3 cups of 1/4 liter each. How many liters of juice are left?

   2.5
7. 7.

   Esme records four daily temperature changes: -2.5, 0.5, -1.25 and 0.25 degrees. What is the mean daily change?

   -0.75
8. 8.

   Luz divides (-48.3) ÷ 6.9 and the screen flickers. Use a quick estimate. Which answer makes sense?

   • -0.7
   • -7
   • 7
   • -70
9. 9.

   Milo divides 61.6 ÷ (-7.7) on a phone, and a notification covers the answer. Use a quick estimate. Which answer makes sense?

   • 8
   • -0.8
   • -80
   • -8
10. 10.

    Noah multiplies (-0.48) × 0.52, but the pen runs out before the answer. Use a quick estimate. Which answer makes sense?

    • -0.02496
    • -2.496
    • 0.2496
    • -0.2496