U1, C1 - Real Numbers

Question 1

Natural Numbers

Answer 1

Think counting.
Zero is NOT a natural number, it is tha absence of something & cant be counted.
1, 2, 3, 4
Is considered a real number.

Question 2

Whole Numbers

Answer 2

Includes all natural numbers & zero
0, 1, 2, 3
Is considered a real number.

Question 3

Integers

Answer 3

All nat numbers & whole numbers are ints.
Ints include negatives.

-2, -1, 0, 1, 2 …
Is considered a real number.

Question 4

Rational Numbers

Answer 4

Includes all natural numbers, whole numbers and integers. Is considered a real number.

Rational numbers are a RATIO of two integers.

A / B where A & B are INTS. B can not be 0 (can not divide by 0)

They have either a terminating or repeating decimal pattern.

Question 5

Irrational Numbers

Answer 5

DO NOT include natural numbers, whole numbers, integers or rational numbers.

They ARE still considered a real number.

Can not be written as a ratio of integers.

Irrational numbers are characterized by a non-terminating decimal pattern and a non-repeating decimal pattern.

Many square roots are irrational.

Question 6

Terminating Decimal Pattern

Answer 6

Means a decimal that stops.

Eg: when you write 3/8 as a decimal, its .375
it stops at 3 decimal places.

Question 7

Repeating Decimal Pattern

Answer 7

2/11 written as a dec is 0.18181818…. never stops