G9-MATH-L1 Number Systems

What does the symbol W represent in number systems?

• Whole numbers
• Rational numbers
• Natural numbers
• Integers

Which of the following best describes the relationship between natural numbers and whole numbers?

• All natural numbers are whole numbers, but not all whole numbers are natural numbers
• All whole numbers are natural numbers, but not all natural numbers are whole numbers
• Natural numbers and whole numbers are exactly the same set
• Natural numbers and whole numbers have no numbers in common

What is the key difference between whole numbers and integers?

• Integers include negative numbers
• Whole numbers include fractions
• Integers do not include zero
• Whole numbers are infinite, integers are finite

Which symbol is used to represent the set of all integers?

• Z
• I
• W
• Q

What does the 'Q' in the symbol for rational numbers stand for?

• Quotient
• Quantity
• Quality
• Question

In the definition of a rational number r = p/q, why must q ≠ 0?

• Division by zero is undefined
• To ensure the number is positive
• To make sure the fraction can be reduced
• It's an arbitrary rule

Which of the following is NOT included in the set of rational numbers?

• Natural numbers
• Whole numbers
• Integers
• Irrational numbers

How can the integer -25 be written as a rational number?

• -25/1
• 25/-1
• Both -25/1 and 25/-1
• It cannot be written as a rational number

What is meant by 'co-prime' when referring to the p and q in a rational number p/q?

• p and q have no common factors other than 1
• p and q are both prime numbers
• p and q are consecutive integers
• The sum of p and q is a prime number

Which fraction would be chosen to represent all equivalent fractions of 1/2 on the number line?

• 1/2
• 2/4
• 3/6
• 4/8