A focused Grade 7 learning session for Stem-and-Leaf Plots using visual models, worked examples, strategy guidance, and a short mastery check.
Student goal: I can solve problems involving stem-and-leaf plots.
Stem-and-Leaf Plots is part of Grade 7 Statistics. This activity focuses on the central idea students need before they move into independent practice.
Students will build Grade 7 mastery of stem-and-leaf plots using models, equations, and test-style reasoning.
| What to notice | How to use it |
|---|---|
| Numbers, units, labels, diagrams, or graphs | Identify what each part represents before calculating. |
| The relationship in the problem | Connect the model to an equation, comparison, or explanation. |
Use the figures and worked questions in the practice set below as the visual model for this skill.
Read the first practice question slowly. Decide what the question is asking, choose a strategy, solve, and then compare your reasoning with the answer explanation.
For Stem-and-Leaf Plots, a strong worked example should show the setup, the calculation or model, and a final answer that matches the context.
Many Grade 7 test questions use real situations. Look for quantities, units, rates, measures, expressions, or data values that connect the math to the story.
After solving, explain what the answer means in the situation, not just the number you calculated.
I can solve problems involving stem-and-leaf plots.
Use the warmup, guided question, practice set, and exit questions below to check whether this skill is ready or needs more practice.
Use scratch paper. The explanation matters more than simply seeing whether the choice is correct.
A stem-and-leaf plot has stem \(3\) with leaves \(2, 5, 7, 8\). Which values does this represent?
Answer B: \(32, 35, 37, 38\)
Each leaf combines with its stem: stem \(3\) + leaf \(2\) = \(32\), stem \(3\) + leaf \(5\) = \(35\), etc.
The stem-and-leaf plot below shows test scores. What is the minimum score?
Answer A: \(42\)
The smallest stem is \(4\) with the smallest leaf \(2\), giving \(42\).
The stem-and-leaf plot below shows test scores. What is the maximum score?
Answer A: \(76\)
The largest stem is \(7\) with the largest leaf \(6\), giving \(76\).
The stem-and-leaf plot shows heights (in cm) of students: How many students are represented?
Answer C: \(12\)
Count all leaves: \(3 + 4 + 3 + 2 = 12\) data points.
A stem-and-leaf plot has stems \(5, 6, 7\) with leaves: What is the range of the data?
Answer B: Stem \(6\): \(0, 3, 8\)
Minimum is \(51\), maximum is \(76\). Range \(= 76 - 51 = 25\).
The stem-and-leaf plot shows: How many data values fall between \(30\) and \(40\) (inclusive)?
Answer C: \(4\)
Values in the range: \(31, 34, 34, 37\) (all from stem \(3\)) \(= 4\) values.
In a stem-and-leaf plot, the stem represents the tens digit and leaves represent the ones digit. If a value is \(67\), what stem and leaf should be written?
Answer A: Stem \(6\), Leaf \(7\)
The tens digit (\(6\)) is the stem; the ones digit (\(7\)) is the leaf.
The stem-and-leaf plot displays class test scores: What is the median score?
Answer A: \(85\)
There are \(13\) values (odd). Ordered: \(72, 75, 78, 78, 81, 83, 85, 86, 89, 90, 92, 94, 97\). The 7th value is \(85\).
A data set has values: \(12, 15, 15, 18, 21, 23, 24, 28\). Which is the correct stem-and-leaf plot?
Answer A: Stem \(1\): \(2, 5, 5, 8\); Stem \(2\): \(1, 3, 4, 8\)
Leaves must be listed in order and correspond to the tens digit (stem).
The stem-and-leaf plot shows: What is the mode?
Answer D: No mode
Each value appears exactly once, so there is no repeating value. There is no mode.
Three-digit data in a stem-and-leaf plot with stem \(14\) and leaves \(2, 5, 8\) represents which values?
Answer A: \(142, 145, 148\)
With a two-digit stem (\(14\)), leaves are the ones place: \(142, 145, 148\).
