Chart Reading Practice Test Worksheets
Build confidence with printable chart reading worksheets and focused graph interpretation practice tests. Students learn to read line graphs, compare values across intervals, identify increases and decreases, and calculate changes accurately from visual data.
For students who can read plotted values, but need practice comparing interval changes without rushing.
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What Do Chart Reading Questions Look Like?
Line graph questions show data changing across discrete intervals, such as hourly measurements or weekly milestones. Students must read values off the axes, calculate interval differences (current minus previous), and identify specific features such as greatest decreases or smallest positive gains. Here is a worked example.
At the end of which hour did the smartphone's battery level decrease the most?
Options:
A) 6 hours
B) 3 hours
C) 7 hours
D) 1 hour
E) 5 hours
Worked Method
Step 1: Calculate the decreases: Start to 1 hour is 45 - 60 = -15 percentage points.
Step 2: Other decreases are 40 - 50 = -10 percentage points, 70 - 75 = -5 percentage points, and 60 - 70 = -10 percentage points.
Step 3: The greatest decrease is the largest drop: 15 percentage points, ending at 1 hour.
Answer: D, 1 hour.
Tip: Compare the drops between neighbouring points. The lowest battery level does not necessarily mark the largest drop.
Rules to Help You Solve Chart Reading Questions
To solve chart reading questions like the battery level example above, focus on changes between adjacent points rather than simply looking for the highest or lowest plotted point.
Rule 1: Identify the interval's ending time
Read both plotted values to calculate the change. The answer option names the time at the end of that interval, such as 7 hours or Day 4.
Example: A change from 6 hours to 7 hours is reported as 7 hours.
Rule 2: Subtract previous from current
Work out each interval as current value minus previous value.
Example: 80 - 70 = +10, while 60 - 75 = -15.
Rule 3: Match the wording
Greatest increase, greatest decrease, and smallest positive increase are different questions.
Example: +2.5 is smaller than +7.5, but 0 is not a positive increase.
Rule 4: Ignore flat intervals for gains
A zero change is no increase and no decrease, so it cannot answer a positive-increase question.
Example: 35 - 35 = 0, so it is flat, not a gain.
Two More Worked Examples
Here are two more examples showing how to calculate positive increases and avoid flat-interval traps.
At the end of which hour did the wind speed have the smallest positive increase?
Options:
A) 3 hours
B) 2 hours
C) 5 hours
D) 1 hour
E) 7 hours
Worked Method
Step 1: List the positive changes: Start to 1 hour is +2.5 km/h, 1 to 2 hours is +7.5 km/h, and 2 to 3 hours is +10 km/h.
Step 2: Continue checking increases: 4 to 5 hours is +7.5 km/h, 5 to 6 hours is +10 km/h, and 7 to 8 hours is +7.5 km/h.
Step 3: The smallest positive increase is +2.5 km/h, ending at 1 hour.
Answer: D, 1 hour.
Tip: Compare only changes greater than zero, then name the hour at the end of the interval with the smallest increase.
At the end of which week did the baby's weight have the smallest positive gain?
Options:
A) 1 week
B) 2 weeks
C) 6 weeks
D) 5 weeks
E) 3 weeks
Worked Method
Step 1: Calculate the gains: Birth to week 1 = +0.3 kg, week 1 to week 2 = +0.2 kg, week 2 to week 3 = +0.1 kg.
Step 2: Weeks 4, 5, 6, and 7 have 0 kg change. Week 7 to week 8 is 3.9 - 4.0 = -0.1 kg, a loss. Exclude all of these intervals because none has a positive gain.
Step 3: The smallest positive gain is +0.1 kg, ending at week 3.
Answer: E, 3 weeks.
Tip: A flat interval has zero change and a falling interval has negative change. Neither can be the smallest positive gain.
