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Quizzes > Personality & Relationships > Puzzles & Riddles

Free IQ Test for Dummies: Are You Smarter Than You Think?

Dive into this free IQ quiz - test your critical thinking now!

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art style quiz illustration on teal background with brain puzzle shapes numeric logic memory reasoning symbols

This free IQ test helps you check your logic, memory, and pattern spotting with quick brain puzzles. Play at your own pace, then get a clear score and a hint of how you think. When you're set, start the quiz to practice and see where you stand.

What number comes next in the series: 2, 4, 6, 8, ?
9
16
12
10
This is an arithmetic progression increasing by 2 each time, so after 8 comes 10. See more on arithmetic sequences .
Which shape does not belong: Circle, Square, Triangle, Sphere?
Circle
Sphere
Triangle
Square
Circle, square, and triangle are two-dimensional shapes, while a sphere is three-dimensional. Learn about 3D shapes .
If all Bloops are Razzies and all Razzies are Lazzies, which statement is true?
All Lazzies are Bloops
No Bloops are Lazzies
All Bloops are Lazzies
Some Razzies are Bloops
By transitive logic, if Bloops ? Razzies and Razzies ? Lazzies, then Bloops ? Lazzies. This follows classic syllogism rules .
Using A=1, B=2, ... Z=26, what is the sum of C + A + T?
22
23
24
26
C=3, A=1, T=20, so 3+1+20=24. Learn about alphabetical indexing .
What letter comes next in the sequence: J, L, N, P, ?
Q
R
S
T
Letters increase by two positions in the alphabet: J?L?N?P?R. See letter sequences .
If 3 cats catch 3 mice in 3 minutes, how many cats are needed to catch 100 mice in 100 minutes?
100
3
33
9
Each cat catches one mouse in three minutes, so 3 cats catch 100 mice in 100 minutes at the same rate. See work-rate problems .
You walk 3 blocks east, 3 blocks north, 3 blocks west, and 3 blocks south. Where are you?
3 blocks east
At the corner of the city block
3 blocks north
Back where you started
The east and west moves cancel, as do the north and south, returning you to the start. See displacement basics .
Rearrange the letters in "LISTEN" to form a word meaning quiet.
ENLIST
INLEST
SILENT
TINSEL
"LISTEN" is an anagram of "SILENT." Learn more about anagrams .
What number logically follows this sequence: 1, 1, 2, 3, 5, 8, ?
11
10
13
12
This is the Fibonacci sequence where each term is the sum of the two preceding terms. Read more .
In a family, the son of my grandmother is not my father. Who is he?
My cousin
My brother
My uncle
My grandfather
The son of your grandmother who isn't your father must be your uncle. See family relationship puzzles .
Which number comes next in the pattern: 4, 9, 16, 25, ?
36
32
49
30
These are square numbers: 2², 3², 4², 5², so the next is 6² = 36. More on square numbers .
Which of these is a cube number?
30
25
20
27
27 is 3³. Learn about cubes in algebra .
If it takes 5 machines 5 minutes to make 5 widgets, how long for 100 machines to make 100 widgets?
20 minutes
50 minutes
100 minutes
5 minutes
Each machine makes one widget in 5 minutes, so 100 machines still make 100 widgets in 5 minutes. See work-rate explanation .
In logic, if some A are B, and no B are C, which conclusion is valid?
Some A are not C
All A are C
Some B are C
No A are B
If some A are B and those B cannot be C, at least those A cannot be C. Learn categorical logic .
If RED = 3, BLUE = 4, GREEN = 5 by counting letters, what is ORANGE?
7
6
3
5
ORANGE has 6 letters. See word length puzzles .
A man pushes his car to a hotel and says he's bankrupt. Why?
He sold the car
He's playing Monopoly
He lost at poker
His car broke down
This riddle refers to the board game Monopoly. More on the puzzle .
Fish is to school as bird is to?
Swarm
Herd
Pack
Flock
A group of fish is called a school and a group of birds is called a flock. See collective nouns .
You have three boxes labeled Apples, Oranges, and Apples & Oranges. All labels are wrong. How can you correctly label the boxes by picking one fruit from a box?
Pick from the box labeled Oranges
Cannot determine
Pick from the box labeled Apples
Pick from the box labeled Apples & Oranges
Picking from the wrongly labeled mixed box reveals a single fruit type, allowing you to relabel all boxes correctly. More on this .
What is the next number in the series 3, 9, 27, ?
72
81
54
99
Each term is multiplied by 3. So 27 × 3 = 81. Learn about geometric progressions .
In the cryptarithm SEND + MORE = MONEY, what digit does O represent?
9
1
8
0
Solving the classic puzzle yields O = 0. See SEND+MORE=MONEY solution .
What number comes next in the sequence: 7, 10, 8, 11, 9, 12, ?
14
13
11
10
Two interleaved sequences: 7?8?9?10 and 10?11?12?13. Next in the first is 10. See alternating patterns .
I speak without a mouth and hear without ears. I have nobody, but I come alive with wind. What am I?
Ghost
Echo
Whistle
Shadow
An echo fits all clues. See the classic riddle .
If x + 1/x = 4, what is x² + 1/x²?
16
10
12
14
Square both sides: (x+1/x)² = x² + 2 + 1/x² = 16, so x²+1/x² = 16?2 = 14. More on this algebra .
In the famous Einstein "Zebra Puzzle," who owns the fish?
The Swede
The Dane
The German
The Norwegian
Logic deduction in the zebra puzzle shows the German ends up with the fish. Read the full solution .
There are 10 black socks and 6 white socks in a drawer. If you pull out two at random, what is the probability they are the same color?
25%
50%
37.5%
62.5%
Probability = [C(10,2) + C(6,2)] / C(16,2) = (45+15)/120 = 60/120 = 0.5. More on probability .
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Study Outcomes

  1. Understand Test Structure -

    Identify the different sections and question types in a test for dummies, so you know what to expect when you start your free IQ test.

  2. Analyze Logical Puzzles -

    Break down and solve challenging puzzles in this IQ quiz challenge, honing your ability to spot patterns and draw logical conclusions.

  3. Apply Memory Techniques -

    Use proven strategies to improve recall of sequences, shapes, and facts during the critical thinking quiz portion.

  4. Evaluate Reasoning Skills -

    Assess your deductive and inductive reasoning abilities by working through real-time scenarios designed to test your brainpower.

  5. Measure General Knowledge -

    Gauge your grasp of diverse topics with a general knowledge test that adds an extra layer of challenge to this free IQ test experience.

  6. Interpret Your IQ Score -

    Learn how to read and understand your results, gaining insight into your cognitive strengths and areas for improvement.

Cheat Sheet

  1. Pattern Recognition Practice -

    Many IQ quiz challenges include matrix puzzles where you spot the next shape or number. Draw on Raven's Progressive Matrices exercises from cognitive psychology research - label sequence elements A-B-C and look for repeating transformations. Use the mnemonic "Chunk, Chart, Check" to group patterns, map changes, and verify your choice.

  2. Verbal Analogies Drills -

    Critical thinking quizzes often test word relationships like "Hand is to glove as foot is to sock." Study analogy sets from reputable GRE prep materials at ETS.org to see common relational types (synonym, antonym, part - whole). Remember the tip "Find the Bridge Word" - identify the verb or noun that connects both pairs.

  3. Working Memory Training -

    Short-term memory is key in any free IQ test, especially digit span or letter recall tasks. Practice backward digit spans using Baddeley's model (e.g., 3-1-4 becomes 4-1-3) and chunk long numbers into groups of three or four. The "Phone Number Trick" (grouping digits like 867-5309) boosts your capacity.

  4. Logical Reasoning Exercises -

    General knowledge tests often include syllogisms or if-then puzzles. Review basic logic forms - modus ponens (If P then Q; P; therefore Q) and modus tollens (If P then Q; not Q; therefore not P) - from Stanford's Intro to Logic course. Sketch simple Venn diagrams to visualize relationships and avoid common fallacies.

  5. Speed Math & Fact Recall -

    Many IQ tests for dummies still quiz you on quick arithmetic - multiplication tables, prime numbers, or percentages. Drill fundamental facts using timed flashcards from Khan Academy or Lumosity's brain training platform. Employ "PEMDAS" (Please Excuse My Dear Aunt Sally) to keep order of operations straight under time pressure.

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