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Math Grade 4-5 Answer Key

Line Graphs: Reading and Interpreting Trends

Practice reading values, changes, and patterns on line graphs

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Line Graphs: Reading and Interpreting Trends

Practice reading values, changes, and patterns on line graphs

Math - Grade 4-5

Instructions: Read each problem carefully. Use the data or graph description to answer each question. Show your work in the space provided.
  1. 1

    A line graph shows the height of a bean plant over 4 weeks. The points are Week 0: 2 cm, Week 1: 4 cm, Week 2: 7 cm, Week 3: 9 cm, and Week 4: 12 cm. How tall was the plant at Week 3?

    Find Week 3 on the bottom axis, then read the height value.

    The plant was 9 centimeters tall at Week 3.
  2. 2

    A line graph shows library visitors from Monday to Friday. The values are Monday: 20, Tuesday: 35, Wednesday: 30, Thursday: 45, and Friday: 50. Describe the overall trend.

    The overall trend is increasing because the number of visitors went from 20 on Monday to 50 on Friday. There was one small decrease from Tuesday to Wednesday.
  3. 3

    A line graph shows the temperature during the day. The values are 8 a.m.: 60°F, 10 a.m.: 65°F, 12 p.m.: 72°F, 2 p.m.: 76°F, and 4 p.m.: 74°F. During which time interval did the temperature increase the most?

    Subtract each earlier temperature from the next temperature and compare the increases.

    The temperature increased the most from 10 a.m. to 12 p.m. because it rose from 65°F to 72°F, an increase of 7°F.
  4. 4

    A savings line graph shows January: $15, February: $25, March: $40, April: $40, and May: $55. Between which two months did the savings stay the same?

    Look for two points in a row with the same value.

    The savings stayed the same from March to April because both months show $40.
  5. 5

    A line graph shows the number of miles Mia biked each day. The values are Monday: 2 miles, Tuesday: 3 miles, Wednesday: 5 miles, Thursday: 4 miles, and Friday: 6 miles. How many more miles did she bike on Friday than on Monday?

    Mia biked 4 more miles on Friday than on Monday because 6 minus 2 equals 4.
  6. 6

    A line graph shows a team's points over five games. The values are Game 1: 12 points, Game 2: 18 points, Game 3: 15 points, Game 4: 20 points, and Game 5: 24 points. How many points did the team score in Game 3, and how did that compare to Game 2?

    Read the value at Game 3, then compare it with the value at Game 2.

    The team scored 15 points in Game 3. That was 3 fewer points than in Game 2 because 18 minus 15 equals 3.
  7. 7

    A line graph shows ice cream cones sold each hour. The values are 10 a.m.: 5 cones, 11 a.m.: 9 cones, 12 p.m.: 15 cones, 1 p.m.: 22 cones, 2 p.m.: 20 cones, and 3 p.m.: 18 cones. At what time were the most cones sold, and what happened after that time?

    The most cones were sold at 1 p.m., when 22 cones were sold. After 1 p.m., the number of cones sold decreased.
  8. 8

    A line graph shows a puppy's weight over 6 months. The values are Month 1: 6 pounds, Month 2: 8 pounds, Month 3: 10 pounds, Month 4: 13 pounds, Month 5: 13 pounds, and Month 6: 15 pounds. Between which two months did the puppy gain the most weight?

    Find the change between each pair of months.

    The puppy gained the most weight from Month 3 to Month 4 because its weight increased from 10 pounds to 13 pounds, a gain of 3 pounds.
  9. 9

    A line graph shows rainfall over five weeks. The values are Week 1: 3 cm, Week 2: 1 cm, Week 3: 4 cm, Week 4: 2 cm, and Week 5: 5 cm. Which week had the lowest rainfall, and which week had the highest rainfall?

    Week 2 had the lowest rainfall with 1 centimeter. Week 5 had the highest rainfall with 5 centimeters.
  10. 10

    A double line graph shows pages read by Ana and Ben from Monday to Friday. Ana read 10, 15, 20, 22, and 25 pages. Ben read 12, 14, 16, 21, and 27 pages. Who read more pages on Friday, and by how many pages?

    Compare the Friday values for both students.

    Ben read more pages on Friday. He read 27 pages, which is 2 more pages than Ana's 25 pages.
  11. 11

    A line graph shows aquarium water temperature. The values are Monday: 70°F, Tuesday: 70°F, Wednesday: 71°F, Thursday: 73°F, and Friday: 72°F. What does the flat part from Monday to Tuesday show?

    The flat part from Monday to Tuesday shows that the temperature did not change. It stayed at 70°F on both days.
  12. 12

    A line graph shows tickets sold during the first 6 days of a school play sale. The values are Day 1: 25, Day 2: 30, Day 3: 45, Day 4: 45, Day 5: 60, and Day 6: 80. How many more tickets were sold by Day 6 than by Day 4?

    There were 35 more tickets sold by Day 6 than by Day 4 because 80 minus 45 equals 35.
  13. 13

    A line graph connects the point 1 p.m.: 8 liters to the point 2 p.m.: 12 liters with a straight line. Estimate the amount at 1:30 p.m.

    Use the halfway point between the two times and the two amounts.

    The estimated amount at 1:30 p.m. is 10 liters because 1:30 p.m. is halfway between 1 p.m. and 2 p.m., and 10 is halfway between 8 and 12.
  14. 14

    A line graph shows steps walked during a school week. The values are Monday: 3,000 steps, Tuesday: 4,500 steps, Wednesday: 4,000 steps, Thursday: 6,000 steps, and Friday: 7,000 steps. Between which two days did the number of steps decrease?

    The number of steps decreased from Tuesday to Wednesday because it went from 4,500 steps down to 4,000 steps.
  15. 15

    A line graph would show cafeteria milk sales for the week as Monday: 80 cartons, Tuesday: 75 cartons, Wednesday: 70 cartons, Thursday: 78 cartons, and Friday: 85 cartons. Describe the trend from Monday to Wednesday, then from Wednesday to Friday.

    Compare the values at the start and end of each part of the week.

    From Monday to Wednesday, the trend decreased from 80 cartons to 70 cartons. From Wednesday to Friday, the trend increased from 70 cartons to 85 cartons.
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