P2 Maths | Bar Charts Lesson Guide for Tutors | Reading and Drawing One Square One Vote

2026-11-08

Tutor lesson-prep guides · Primary Maths

Pupils read which bar is longest but start guessing as soon as the question asks how many more. This lesson turns square counting into the only accepted method.

Objectives — Pupils can: 1) name the title, the horizontal axis and the vertical axis of a bar chart; 2) read any bar by counting squares from the baseline; 3) compare two bars and work out the difference in votes; 4) draw a bar with the correct number of squares and label the title and both axes.

01 Prerequisites (3-minute check)

If any of these fails, fix it before the lesson starts.

Skill	Quick check	Pass mark
Addition and subtraction to 20	8 plus 5, 8 minus 3	totals and differences
One to one matching	one symbol stands for one object	one square stands for one vote

02 Lesson flow (40 minutes)

Time	Stage	Tutor does	Student does
0-6 min	Tell the story of the chart	what is it about, what does the title say	favourite fruit
6-16 min	Count the squares	how many squares is the apple bar	8 squares means 8 votes
16-26 min	Compare and subtract	how many more apples than grapes	8 minus 3 is 5 votes
26-36 min	Draw one bar	3 votes for grapes needs how many squares	3 squares from the baseline
36-40 min	Exit check	three questions	all correct to pass

03 Teaching script (read it out)

Scene 1: Act 1: the length of the bar is the quantity

Skip the word statistics. Show a finished chart: apples 8, bananas 5, oranges 6, grapes 3. Ask which fruit is most popular. Pupils answer correctly from the height of the bars, and that deserves praise. Then ask how many more, and the guessing starts. Pull out three parts: the title, the fruit names along the bottom axis, and the numbered squares up the side axis. The bars are measured, not estimated.

Tutor line: you are right about the most popular. Now I want how many more, and we do not guess. We count squares.

Scene 2: Act 2: count squares, one square is one vote

Put a finger on the baseline and count up one square at a time until the top of the bar. Eight squares is eight votes. Count the apple bar together, then let the pupil count bananas and grapes alone. The grape bar is only three squares and looks very short, so say clearly that short does not mean zero. Compare: eight squares against three, a difference of five squares, which is five votes, written as 8 minus 3 equals 5.

Tutor line: start at the baseline, count up, stop at the top. Apples are eight squares, grapes are three, so the difference is five squares.

Scene 3: Act 3: drawing needs the title and both axes

Ask the pupil to draw the grape bar on squared paper: three squares up from the baseline, then a flat top. Then check three things: the title, the fruit names along the bottom, and the side label with votes per square. If any of the three is missing the chart does not say anything. Finish by asking what happens if one square stands for two votes, so the pupil finds that three votes needs one and a half squares, which cannot be drawn, and that is why P2 keeps one square to one vote.

Tutor line: when the bar is drawn, ask three questions: is there a title, what is written below, what is written at the side. All three or it is not finished.

04 Question types and worked steps

Type	Example	Steps
Reading one bar	start at the baseline, count squares up, read the number	count up, never down
Comparing bars	read both bars, decide which is longer, say how many more	the word more needs a number after it
Finding the difference	larger minus smaller, then write the unit	the answer always carries a unit
Drawing from data	fix the square count, draw from the baseline, close the top, label title and axes	all three labels or it is incomplete

Sanity check (teach this): Always count from the baseline; the difference is larger minus smaller with a unit; a bar never starts in the middle; with one square per vote the square count equals the vote count; title, bottom axis and side axis are all required.

05 Independent practice (3 questions)

Question	Answer	What to watch
Which fruit is most popular and how many votes does it have?	apples, 8 votes	the tallest bar, counted at 8 squares
How many fewer votes do grapes have than oranges?	3 votes	6 minus 3 is 3
How many votes in total across the four fruits?	22 votes	8 plus 5 plus 6 plus 3 is 22
If one square stands for 2 votes, how many squares does the apple bar need?	4 squares	8 divided by 2 is 4
If two more pupils vote for grapes, how many votes and which fruit does it match?	5 votes, matching bananas	3 plus 2 is 5

06 Common mistakes and what to say

Mistake	Student writes	Say this
Counting from the top down	the top square is read as one vote	always start at the baseline, the first square is one
Subtracting the wrong way	grapes have fewer, so writing 3 minus 6	how many fewer means larger minus smaller, never negative
Treating a short bar as zero	saying nobody voted for grapes	short still counts, three squares is three votes
Leaving out the title or an axis label	a finished bar that says nothing	title, bottom, side, all three before handing in

07 Homework (paper, section and question numbers)

Independent practice in this chapter (questions 1 to 5 above) — questions 1 to 3: reading and differences; 4 to 5: squares and prediction
Primary maths chapter index (related chapters at this level) — question 6: count three kinds of objects at home and draw a three bar chart

08 Exit check (last 5 minutes)

Question	Answer	Decision
Bananas have 5 votes and one square is one vote. How many squares?	5 squares	wrong: redo counting from the baseline
What is the difference between the most and the least?	5 votes	wrong: redo larger minus smaller
Which three labels must a bar chart carry?	title, horizontal axis label, vertical axis label with unit	wrong: redraw one chart and check all three

09 Tutor FAQ

Should one square for two be taught in P2?

Only as a spoken extension, never assessed. One square for one vote builds the idea that squares are quantities, and swapping the scale too early destroys it.

Should pupils draw the grid or be given one?

Give squared paper first so the pupil only colours bars. Only later hand out blank paper.

Is a correct answer without a reason good enough?

No. The pupil must say which square the bar reaches, otherwise the answer is a height guess.

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A TutorZone lesson-prep guide. Written by the TutorZone team; questions and lesson flow are original and are not taken from any school or publisher material.