# What's My Number? Trivia Quiz

### Can you find the number that matches each description?

A matching quiz by looney_tunes. Estimated time: 4 mins.

Author
looney_tunes
Time
4 mins
Type
Match Quiz
Quiz #
380,057
Updated
Dec 03 21
# Qns
10
Difficulty
Average
Avg Score
8 / 10
Plays
780
Awards
Top 35% Quiz
Last 3 plays: Guest 188 (10/10), Guest 122 (10/10), Guest 86 (2/10).
Mobile instructions: Press on an answer on the right. Then, press on the gray box it matches on the left.
(a) Drag-and-drop from the right to the left, or (b) click on a right side answer box and then on a left side box to move it.
 Questions Choices 1. The only integer which is neither positive nor negative. 4 2. The smallest perfect number. 15 3. Number of dimensions of a plane (mathematical, not aeronautical). 1 4. Number of faces on an icosahedron. 6 5. The fifth triangular number. 6 6. Number of faces on a cube. 2 7. Number of equal sides in an isosceles triangle. 8 8. Number of vertices on a cube. 0 9. The only positive integer which is neither prime nor composite. 20 10. Number of dimensions of a tesseract. 2

Quiz Answer Key and Fun Facts
1. The only integer which is neither positive nor negative.

A positive number is greater than zero, while a negative number is less than zero (which is indicated by writing it with a - before the digits that represent its magnitude). 0 itself is the only number which is neither greater than zero nor less than zero.
2. The smallest perfect number.

A perfect number is a positive integer which is the sum of all its proper divisors. Clear as mud? The divisors are the numbers that can divide evenly into a given number, and the proper divisors are smaller than the original number. The divisors of 6 are 1, 2, 3 and 6 (since 6 = 1x6 and 6=2x3). The proper divisors are 1, 2 and 3. The sum of these three numbers is 1+2+3 = 6. This is the smallest number for which it works:
1 - no proper divisors
2 - 1
3 - 1
4 - 1+2 = 3
5 - 1
3. Number of dimensions of a plane (mathematical, not aeronautical).

A point has no dimensions. If a point is translated in a single direction, the result is a line, which has one dimension. If a line is translated in a direction perpendicular to its length, a plane is produced, which has two dimensions.
4. Number of faces on an icosahedron.

If your Greek is good, you should recognise the prefix used to describe a polyhedron with twenty sides. A regular icosahedron has equilateral triangles for its faces, with five triangles meeting at each of its twelve vertices.
5. The fifth triangular number.

Triangular numbers are a sequence which can be listed as 1, 3, 6, 10, 15, 21, ... - as you can see, each number is larger than the previous one by an amount which increases by 1 each time. Since this is a tedious procedure if you want to know, say, the 100th one, there is a formula which can be used to calculate it: Tn = n(n+1)/2.

The 100th triangular number is therefore 100x101/2, or 505.
6. Number of faces on a cube.

A cube is a three-dimensional figure made up of 6 squares - a standard die is probably the most familiar example. A cuboid is a similar shape, but with some or all of the faces being rectangles instead of squares - think of a ream of paper, for example.
7. Number of equal sides in an isosceles triangle.

A triangle with no equal sides is called a scalene triangle, while one with all three sides equal is an equilateral triangle. As well as names describing the relative lengths of a triangle's sides, they can also be given a name that tells you the size of the largest of the three angles: for an acute triangle, all angles are less than 90 degrees; for a right angled triangle, one angle is 90 degrees; for an obtuse angled triangle, one angle is between 90 and 180 degrees. Since the sum of the three angles in a triangle is always 180 degrees, no one angle can be as large as 180, let alone larger than that.
8. Number of vertices on a cube.

The vertices are often referred to as corners in everyday usage, but mathematicians prefer the technical term vertex to refer to a point where two or more faces of a polyhedron meet. For a cube, there are three square faces meeting at each vertex.
9. The only positive integer which is neither prime nor composite.

The definition of a prime number is that it is a number greater than one which is divisible only by itself and one. (This definition eliminates a number of mathematical paradoxes that would arise if 1 were included as a prime number.) A composite number is one with at least two proper divisors (two numbers smaller than itself by which it is divisible).

For example, 2 can only be divided by 1 and 2, so it is the smallest prime number; 4 can also be divided by 1 and 2, and is the smallest composite number.
10. Number of dimensions of a tesseract.

As described earlier a point can be translated to generate a line, which can be translated to generate a plane. If we only use a segment of the line, we can translate it so as to form a square. If that square is moved upwards, in a third dimension perpendicular to that of the original plane, we can produce a cube. Now, mathematically (if not physically), that same process can be repeated using a fourth dimension that is orthogonal to the cube, called a tesseract.
Source: Author looney_tunes

This quiz was reviewed by FunTrivia editor rossian before going online.
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Most Recent Scores
Jan 23 2023 : Guest 188: 10/10
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Dec 20 2022 : Vendetta125: 4/10
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Score Distribution

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This quiz is part of series Maths Challenges:

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