12 multiple-choice questions, progressively harder.
The bar graph shows goals scored by four players. How many goals did Ben score?
Solution
Correct answer: D
Ben's bar tops out halfway between the 888 and 101010 gridlines.
Ben=9\text{Ben} = 9Ben=9
A bar can land between gridlines, so read the halfway mark carefully.
On this bar graph the scale starts at 444444. Reading the numbers off the scale, what is the actual difference between Brand A and Brand B?
Correct answer: C
Read each bar's true value off the scale: Brand A is 525252 and Brand B is 484848.
52−48=452 - 48 = 452−48=4
The bars look very different only because the scale is cut off at 444444; the real gap is small.
The line graph shows daily high temperatures. What was the size of the biggest one-day rise?
Correct answer: A
Compare each rising segment. The steepest climb is Tuesday to Wednesday, from 202020 to 505050.
50−20=3050 - 20 = 3050−20=30
That jump of 303030 is larger than any other day-to-day change.
A circle graph has four slices. Three are labeled 20%20\%20%, 15%15\%15%, and 30%30\%30%. What percent is the fourth slice?
All slices add to 100%100\%100%, so subtract the three known slices from the whole.
100%−20%−15%−30%=35%100\% - 20\% - 15\% - 30\% = 35\%100%−20%−15%−30%=35%
The bar graph shows goals by four players. How many more goals did Ben score than Cal?
Correct answer: B
Read both bars: Ben is 999 and Cal is 333.
9−3=69 - 3 = 69−3=6
A line graph of a plant's height stops at Week 5, where the plant is 505050 cm tall. What does the graph tell you about Week 8?
A line graph only reports the data that was plotted, and it stops at Week 5.
no data past Week 5 ⇒ Week 8 is unknown\text{no data past Week 5} \;\Rightarrow\; \text{Week 8 is unknown}no data past Week 5⇒Week 8 is unknown
Reading a value past the last point is a guess, not a reading.
On the brand comparison graph, why does Brand A's bar look about twice as tall as Brand B's, even though their values are close?
Because the axis begins at 444444, only the part of each value above 444444 is drawn, which exaggerates a small gap.
A above 44=8,B above 44=4\text{A above 44} = 8, \quad \text{B above 44} = 4A above 44=8,B above 44=4
The drawn heights are in the ratio 888 to 444, even though 525252 and 484848 are nearly equal.
You want to show what fraction of your day is spent sleeping, in school, and at play. Which display fits best?
The three parts make up one whole day, so you want to show parts of a whole.
parts of a whole ⇒ circle graph\text{parts of a whole} \;\Rightarrow\; \text{circle graph}parts of a whole⇒circle graph
Each activity becomes a slice of the same circle.
The circle graph shows favorite foods of 300300300 students. How many students chose Salad?
Salad is 20%20\%20% of the 300300300 students.
20100×300=60\frac{20}{100} \times 300 = 6010020×300=60
The bar graph shows goals by four players. What is the total number of goals scored by all four?
Read all four bars and add: Ana 555, Ben 999, Cal 333, Dan 777.
5+9+3+7=245 + 9 + 3 + 7 = 245+9+3+7=24
A bar graph of favorite fruits shows Apple at 888 and Banana at 555. Which conclusion does the graph support?
Only read what the bars actually measure: how many students chose each fruit.
Apple 8>Banana 5\text{Apple } 8 > \text{Banana } 5Apple 8>Banana 5
The graph supports that more chose apple; it says nothing about health, everyone, or the future.
The double bar graph shows goals by the Lions and Bears. In how many of the three games did the Lions score more than the Bears?
Compare the paired bars in each game. Lions: 6,4,86, 4, 86,4,8; Bears: 2,6,42, 6, 42,6,4.
6>2 (Game 1),4<6 (Game 2),8>4 (Game 3)6 > 2 \;(\text{Game 1}), \quad 4 < 6 \;(\text{Game 2}), \quad 8 > 4 \;(\text{Game 3})6>2(Game 1),4<6(Game 2),8>4(Game 3)
The Lions win in Game 1 and Game 3, so 222 games.
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