IQ Questions for Kids: Logic Puzzles by Age (5 to 12)

Two kinds of puzzle get filed together under IQ questions for kids, and they test opposite things. A trick question catches a child out by misdirection: the information is there, but the wording steers them past it. A reasoning puzzle hides nothing at all, and a child gets it wrong because they have not yet found the rule.

The distinction matters because the two produce different kinds of learning. Trick questions teach a child to slow down and read properly, which is worth having. Reasoning puzzles are the ones that actually look like what an IQ test measures, and they are the ones most lists of "brain teasers" skip.

Below are both, sorted by age, with answers and with the rule named each time so you can talk about the thinking rather than just marking it right or wrong.

What an IQ-style question actually looks like

Real reasoning items come in four shapes, and recognising them helps you pick the right puzzle for a child who is stuck.

• Sequences. A row of numbers or shapes with one missing. The child infers the step.
• Analogies. Cat is to kitten as sheep is to what. Relationship, mapped across.
• Odd one out. Four items, one does not belong. More than one defensible answer is common, which is a feature rather than a flaw.
• Shape patterns. A grid where a figure rotates, flips or gains a feature step by step.

None of these require knowledge a child has been taught. That is the point of them, and it is why they work across a wide range of attainment: a child who is behind in maths can be excellent at sequences.

Reasoning puzzles for ages 5 to 8

At this age keep it visual and verbal, and avoid anything needing fluent reading.

1. What comes next: circle, square, circle, square, ...? Circle. Rule: a repeating two-step pattern.
2. 2, 4, 6, 8, what comes next? 10. Rule: add two each time.
3. Which is the odd one out: apple, banana, carrot, pear? Carrot, because the others are fruit. Rule: sort by category, not by colour or size.
4. Big is to small as tall is to what? Short. Rule: opposites, mapped across a pair.
5. A circle, then a circle with a dot, then a circle with two dots. What is fourth? A circle with three dots. Rule: one feature grows by one each step.
6. Hand is to glove as foot is to what? Sock or shoe. Rule: the thing that covers it. Both answers are right, which is worth saying out loud.

If a child stalls on the sequences, say the row out loud with them rather than pointing at the answer. Hearing "two, four, six" often produces the rule when seeing it does not.

Reasoning puzzles for ages 9 to 12

Now the rules can combine, and a child can hold two steps at once.

1. 1, 1, 2, 3, 5, 8, what comes next? 13. Rule: add the two previous numbers. This is the one children remember years later.
2. 2, 6, 18, 54, what comes next? 162. Rule: multiply by three, not add. Children who expect addition get stuck here, which is the useful part.
3. Which is the odd one out: 9, 16, 24, 25? 24, because the others are square numbers. Rule: look for a property, not a size.
4. Doctor is to hospital as teacher is to what? School. Rule: person to workplace.
5. If all roses are flowers, and some flowers fade quickly, must all roses fade quickly? No. Rule: "some" does not carry across. This is the first taste of real logic and children find it genuinely surprising.
6. 31, 28, 31, 30, what comes next? 31. Rule: days in the months, starting in January. Nearly everyone tries arithmetic first.
7. A triangle rotates a quarter turn clockwise each step. After four steps, where is it? Back where it started. Rule: four quarter turns make a whole turn.

Number 6 is the most instructive one on this page. Children hunt for an arithmetic rule, fail, and then usually need a hint about what the numbers might be counting. The moment they see it is a good demonstration that the rule does not have to be mathematical at all.

Trick questions, and what they are good for

These work by misdirection rather than inference, so they belong in a separate section. They are genuinely useful, just for a different purpose: every one of them punishes reading too fast.

1. A farmer has 17 sheep and all but 9 run away. How many are left? Nine. "All but nine" is the whole sentence.
2. How many months have 28 days? All twelve. Every month contains a 28th.
3. If a red house is made of red bricks and a blue house of blue bricks, what is a greenhouse made of? Glass.
4. You are in a race and overtake the person in second place. What position are you in? Second, not first.
5. Which is heavier, a kilogram of feathers or a kilogram of stone? Neither. They are both a kilogram.
6. A doctor gives you three pills and says take one every half hour. How long do they last? One hour. The first one is now.

Notice what these have in common: a child who gets one wrong did not lack reasoning, they skipped a word. That is a reading habit rather than a thinking skill, and it is worth naming as such when you discuss it, because a child told they are "bad at logic" on the strength of these has been told something untrue.

Do these puzzles make a child smarter?

Not in the broad sense people hope for, and it is worth being straight about that. Practising reasoning puzzles makes a child better at reasoning puzzles. Evidence that the gain spreads out into unrelated schoolwork is much weaker than the marketing around brain training suggests.

There is still a good reason to do them, and it is a different one. These puzzles give a child repeated, low-stakes practice at not knowing the answer immediately. That is rarer in school than it should be, because most school questions arrive in a chapter that tells you which method to use. A child who has learned that being stuck is a normal stage rather than a verdict will handle an unfamiliar maths problem differently, and that habit does carry.

Which means the measure of a good session is not how many they got right. It is whether they stayed with one they could not immediately do. If your child is already anxious about getting things wrong, that is the thing to work on first, and math anxiety in kids covers it properly.

How to use them at home without ruining them

Four things make the difference between a puzzle that teaches and a puzzle that becomes a test.

1. Three or four, slowly. Not twenty. Once a child is racing a list, the stretch disappears and they are pattern-matching to finish.
2. Ask what rule they used, especially when they are right. A correct answer from a wrong rule is a future mistake. This single question is the highest-value thing you can do.
3. Wait longer than is comfortable before helping. The useful part of the puzzle is happening during the silence. Count to sixty after they say they are stuck.
4. Let them set you one. Writing a puzzle that works requires understanding the rule from the other side, and it is the fastest way to find out whether they really have it.

On odd-one-out questions in particular, take the unexpected answer seriously. A child who says the odd one out of apple, banana, carrot, pear is "banana, because it is the only one you peel" has reasoned correctly from a different feature. Marking that wrong teaches them to guess what the adult wants, which is the opposite of what the puzzle is for.

Where this leads next

Reasoning puzzles sit close to two other things worth pulling on. Children who enjoy sequences and patterns usually take to programming quickly, because a program is a rule applied repeatedly, and debugging is the same inference skill pointed at your own work. Children who enjoy the logic items often enjoy competition maths, and how to enter a math competition covers the practicalities, since the entry route is usually the obstacle rather than the ability.

If the puzzles are landing badly rather than well, the question is usually whether a child is bored or struggling, and those look similar from outside. Telling them apart changes what you do next, and building confidence comes before adding difficulty.

Our online math classes are built around the reasoning before the method, which is the same thing these puzzles are doing.