Numbers that look innocent.
Check the statement before your instinct checks out.
Ten questions, with the answers explained. Try them in your head, then open each answer when you're ready.
Play this quiz →QUESTION 1 / 10
Zero is an even integer.
- True
- False
Show answer & explanation+
True
An even integer is divisible by two with an integer result. Zero divided by two is zero.
QUESTION 2 / 10
One is a prime number.
- True
- False
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False
A prime has exactly two positive divisors. One has only one.
QUESTION 3 / 10
The square of a negative real number is always negative.
- True
- False
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False
Multiplying two negative numbers gives a positive result.
QUESTION 4 / 10
One half is greater than one third.
- True
- False
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True
With the same numerator, the smaller positive denominator gives the larger fraction.
QUESTION 5 / 10
Twenty-five percent is the same as one quarter.
- True
- False
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True
Twenty-five out of one hundred simplifies to one out of four.
QUESTION 6 / 10
Every rectangle is a square.
- True
- False
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False
A square needs four equal sides. A rectangle only requires four right angles.
QUESTION 7 / 10
A scalene triangle has three unequal side lengths.
- True
- False
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True
Scalene means all three sides differ in length.
QUESTION 8 / 10
The product of two odd integers is odd.
- True
- False
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True
Multiplying numbers of the form 2a + 1 and 2b + 1 gives another odd number.
QUESTION 9 / 10
The decimal 0.5 equals the fraction 5/100.
- True
- False
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False
0.5 is five tenths, or one half. Five hundredths is 0.05.
QUESTION 10 / 10
A negative number can be larger than another negative number.
- True
- False
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True
For example, -2 is larger than -5 because it lies farther right on the number line.