Pre-Algebra Number Theory

Which of the following are natural numbers?

• -3

• 1 $\frac{1}{4}$  

•  $\sqrt{2}$  

• 5

• Exactly two of the above are natural numbers

Which of the following are integers?

• $-\frac{7}{3}$

• -6

• $\pi$

• 10

• None of the above answers are integers.

Which of the following are rational numbers?

• $3^{\frac{1}{3}}$

• $\frac{\pi}{2}$

• $-\frac{3}{5}$

• $\sqrt{5}$

• 5

Which of the following numbers is prime?

• 6

• 10

• 7

• 2

• 1

Which of the following numbers is composite?

• 45

• 11

• 12

• 19

• 3

What place value is the 8 in within the number 23.683?

• tens place

• tenths place

• hundreds place

• thousandths place

• hundredths place

Denominators should be the same when adding two fractions together.

• True

• False

Which of these is an irrational number?

• 2.5415896533222

• $2.\overline{3}$
  

• $\frac{17}{5}$

• $\sqrt{2}$

• $\frac{\pi}{\pi}$

Which answer has the groups of numbers ordered CORRECTLY from smallest selection to largest selection?

• Whole numbers, Integers, Rational, Irrational, Real Numbers

• Integers, Rational Numbers, Natural Numbers, Whole Numbers

• Natural Numbers, Whole Numbers, Integers, Rational numbers

• Rational Numbers, Natural Numbers, Whole Numbers, Real Numbers

What do we do when we are tasked to multiply two fractions together?

• Find common denominator

• Find least common multiple

• Divide Across

• Multiply Across

• Cross-Multiply