CSA REVIEW Part 1

Which number is both a rational number and an integer?

• $\frac{3}{5}$

• $-\sqrt{13}$

• 0.2

• -6

Answer explanation

The only number that is a integer on the number line is -6. Therefore it is automatically rational.

Which statement is true?

• A rational number times an irrational number is a rational number.

• An irrational number plus an irrational number is a rational number.

• A rational number times an rational number is an irrational number.

• An irrational number plus a rational number is an irrational number.

Answer explanation

Any calm stays calm. Anything crazy will remain crazy.

 $-\sqrt{121}$  

Which statement is NOT true about the number given above?

• The number is a rational number.

• The number is an integer.

• The number is a whole number.

• The number is a real number.

Answer explanation

-11 is NOT a whole number.

Which statement is NOT true about rational numbers?

• Whole numbers are rational numbers.

• Only prime numbers are rational.

• Negative integers and fractions are rational numbers

• Zero is a rational number

Answer explanation

Its not true that only prime numbers are rational. So are fractions, terminating and repeating decimals

Which statement(s) is/are true?

• The product of two rational numbers is rational.

• The sum of a rational numbers and an irrational numbers is rational.

• The sum of a rational number and an irrational number is irrational.

• The product of a non-zero rational numbers and an irrational number is rational.

• The product of a non-zero rational number and a irrational number is irrational.

Answer explanation

Anything thats calms stays calm. Anything crazy will stay crazy.

 $-\frac{5}{8}\times\frac{16}{15}$  If you evaluate the following expression, to which subset with the solution belong?

• Irrational

• Rational

• Integer

• Whole

Answer explanation

R xR=R

Which of the following is a subset of the set of whole numbers?

• Rational

• Irrational

• Natural

• Integer

Answer explanation

Natural goes INTO whole. Its the ONLY cup that fits.

Which of the following numbers is NOT rational?

• $5.\overline{33}$

• $\sqrt{121}$

• $\sqrt{\frac{25}{16}}$

• $\sqrt{7}$

Answer explanation

Non perfect square is irrational

Place the subsets in order from top to bottom according to their letter with the last letter representing the subset by itself on the right. Separate each letter by a comma, NO SPACES.

• A

• B

• C

• D