YK Pao Secondary School
5.1 Rational Number
Class: ______ Name: __________________
1.True or False
(1) 0 is not a rational number.
(
)
(2) A natural number must be a positive number.
(
)
(3) -7 is a whole number.
(
)
(4) The sum of two rational numbers must be a rational number.
(
)
(5) The difference of two rational numbers must be a rational number.
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)
(6) The product of two rational numbers must be a rational number.
(
)
!
2. Fill the following numbers into the blanks
-3,
3
4
75%,
10, ! − , -34.6%,
1
5
! 3 , !π ,
3.14, -0.518, 0
Positive number:
____________________________
Negative number:
_____________________
Nonnegative number: _____________________
Rational number:
Integer:
_____________________
Natural number:
!
_____________________
_____________________
YK Pao Secondary School
3. Multiple choice
(1) Which of the following numbers has the most elements?
A. Integer
B. Natural number
C. Fraction
D. Rational number
(
)
(2) If the price increases 10% can be written as +10%, decreases 8% can be written as
A. 8%
B. 10%
C. +8%
D. -8%
(3) Which of the following statement is true?
(
)
(
)
A. ! π is not a positive number.
B. A negative fraction must be a negative rational number.
C. 0 is not only a positive number but also a negative number.
D. None of the statements is true.
!
4. Short Answer Questions
(1) List two rational numbers whose product is -3.25
!
!
(2) A and B are two rational numbers, A is 5 times as much as B and their sum is 25, find
the value of them.