Odd one out is one of the standard non-verbal reasoning patterns in GL Assessment-style 11+ papers: five shapes are shown, four of them obey a hidden rule, and one breaks it. Your child's job is to find the rule and then spot the shape that doesn't fit. NVR rewards method over raw talent more than any other 11+ subject, which is genuinely good news for parents — children who learn to interrogate a shape systematically routinely overtake "naturally spatial" classmates who rely on gut feeling and guessing.
What the question looks like
In the GL format, an odd-one-out question presents a row of five figures labelled A to E. Four share a common property; one does not. In its NVR cousin, "most unlike," the wording flips — you pick the shape that is least like the others — but the thinking is identical. You will meet several of these per paper, and in reasoning-heavy regions such as Lincolnshire, NVR can carry roughly half of the total marks, so this single pattern is worth real practice time.
Because GL papers are multiple-choice with a separate answer sheet and are tightly timed at roughly 35 to 50 seconds per question, the challenge is not only spotting the rule but spotting it quickly and marking the correct bubble. Speed and accuracy have to grow together.
The visual attributes to scan
Almost every odd-one-out rule is built from a small set of visual properties. Teach your child to run down this checklist, one property at a time, until one shape stands apart:
- Number of sides or number of separate elements in the figure.
- Shading and fill — black, white, striped, dotted, or a shaded fraction of the shape.
- Size of the whole figure or of an internal element.
- Orientation — which way the shape or an arrow points.
- Position of a dot, line, or small shape relative to the larger one.
- Line thickness and line style (solid versus dashed).
- Symmetry — does the figure have a mirror line, and how many?
- Rotation versus reflection of a repeated motif.
The single most powerful habit is to check one property at a time. Most children lose marks not because a question is hard but because they try to compare everything at once and end up confused.
The method, step by step
Here is a reliable routine your child can apply to every odd-one-out question:
- State what four shapes share, out loud. "They all have four sides." Or "they all have one shaded corner."
- Test that rule against all five. If exactly one shape breaks the shared property, you have found the odd one — mark it and move on.
- If two shapes seem to break the rule, you picked the wrong property. A correct rule leaves precisely one exception. Two exceptions means back up and scan the next property on the checklist.
- Ignore red herrings deliberately. Designers add an eye-catching but irrelevant feature — a big shape among small ones — to pull you away from the true rule, which might be about shading or number of sides.
A worked example: suppose four figures each contain a triangle, a square, and a circle, while the fifth contains a triangle, a square, and a pentagon. The distracting size differences do not matter — the shared rule is "contains a circle," and the pentagon shape is the odd one out.
The classic traps
Knowing the common traps in advance turns them from ambushes into easy marks. Watch for these:
- Checking multiple properties at once. The fix is the one-property-at-a-time checklist above.
- Being seduced by size. A dramatically bigger or smaller figure grabs the eye, but the real rule is often shading or element count.
- Confusing rotation with reflection. A rotated shape keeps the same "handedness"; a reflected shape is a mirror image and flips left-to-right. If four motifs are rotations of one another and one is a mirror image, that mirror image is your answer.
- Missing a second simultaneous change. Sometimes two properties vary together across four shapes (say, size grows as shading darkens) and the odd one breaks the pairing.
- Rushing the answer sheet. On a separate OMR sheet, marking bubble D for a question you answered as C throws away a correct piece of reasoning. Teach careful, checked bubbling.
Timing and pacing
Because the clock matters, give your child a concrete per-question budget rather than a vague "work quickly." The table below shows a realistic pacing plan for a typical GL NVR paper.
| Paper feature | Typical value |
|---|---|
| Paper length | about 50 minutes |
| Questions | roughly 60 to 80 across NVR types |
| Target per question | about 35 to 50 seconds |
| Strategy for a stuck question | skip, mark it, return at the end |
The skip-and-return rule is vital: no single odd-one-out question is worth more than the two or three later questions it could cost you. If the rule has not surfaced within about forty seconds, mark a best guess, flag it, and move on.
How odd one out feeds the Standardised Age Score
The 11+ is not marked on raw totals alone. GL converts each raw score into a Standardised Age Score (SAS), which adjusts for your child's exact age in months so a summer-born child is not disadvantaged against an autumn-born peer. The SAS typically runs from about 69 to 141, with 100 as the national average, and many grammar schools look for roughly 111 or above — although the exact qualifying mark varies by area and year, so never rely on a fixed number. Getting the trickier odd-one-out questions right lifts the raw score, and because standardisation is steepest in the middle of the range, a handful of extra correct answers can move the SAS meaningfully.
How to practise this type
Practise in short, focused bursts — ten questions, mark them, then review every error out loud with the prompt "which property did I miss?" That single question turns a wrong answer into a lesson. Little-and-often beats occasional marathons, especially for building the visual vocabulary the checklist depends on.
Our free NVR worksheet sets isolate each pattern so your child can drill odd one out on its own, the full NVR types list maps the whole territory of matrices, series, rotations and codes, and timed mock papers knit the types back together at genuine exam pace. When you are ready for a board-specific run-through, the GL practice papers mirror the real format, and the revision hub sequences everything from Year 4 foundations to Year 6 timed refinement. Parents new to the whole process can start with how the 11+ works.
Frequently asked questions
How do I tell the odd one out from the "most unlike" question?
They are two labels for the same skill. "Odd one out" asks which shape does not belong; "most unlike" asks which is least similar to the set. In both, you find the shared rule and pick the single exception.
What is the fastest way to find the rule?
Run the visual checklist in a fixed order — sides, shading, size, orientation, position, symmetry — and stop the moment one property leaves exactly one exception. A rule that produces two exceptions is the wrong rule.
How long should each question take?
Aim for about 35 to 50 seconds. If nothing surfaces within roughly forty seconds, mark a best guess, flag the question, and return at the end so a single figure never eats into later marks.