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20 questions
Which is a counterexample to the following statement?
If you add two numbers, then the sum is odd.
2+5=7
3+2=5
2+4=6
What is the next term in the sequence?
2, 5, 8, 11, 14, ...
17
15
Which of the following is a counterexample to the following conjecture? If x2 = 4 , then x = 2
x = 4
x = -2
If an animal is furry, then it is a hamster. What would be an appropriate counterexample?
goldfish
frog
cat
If it is a fraction, then it is a number between zero and one. What is an appropriate counterexample?
2/3
4/5
3/2
Find the next number in the sequence.
1, -1, 2, -2, 3, ___
4
-4
-3
Which is a counterexample of: If a four sided shape has two sides the same length, then it must be a rectangle.
quadrilateral
rectangle
square
Which is a counterexample of: Any number divisible by 2 is divisible by 4.
15÷2
20÷4
10÷2
If it is an angle, then it is acute. What is an appropriate counterexample?
70⁰
45⁰
120⁰
Take the following conditional. If true select true, if false pick the counter example.
"If a number is divisible by 3, then it is divisible by 6."
True
9
18
Which of the following is a counterexample:
All birds can fly
Robin
Pig
Penguin
Which of the following is a counterexample:
All animals have 4 legs
Person
Fish
Spider
All of the options
What is the next term:
3, 6, 9, 12, ...
13
15
Which of the following is a counterexample:
If a boy is tall, then he is good at basketball
Lebron is tall and good at basketball
Jerry is short and good at basketball
Frank is tall and bad at basketball
If a shape is round, then it is a circle. What is an appropriate counterexample?
hexagon
oval
Which of these is a counterexample to the following statement?
All vegetables are green.
Banana
Pumpkins
Which of these is a counterexample to the following statement?
If I am not at school then I am on summer break.
Any day in June
Today!
Saturdays!
How would you describe this pattern's rule?
65, 62, 59, 56, 53, 50
Subtract 2
Subtract 3
Which number is a counterexample to the following statement? :
All numbers that are divisible by 2 are divisible by 4
42
12
Used to prove that a conjecture is false.
Counterexample
Inductive Reasoning
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