Class 8 Mathematics | Rational and Irrational Numbers

Mathematics, Class 8

Rational and Irrational Numbers

Fractions and non fractions · Roots on the number line · Scientific notation

What We Will Be Able to Do

🔢

Tell a rational number from an irrational one

➗

Turn a recurring decimal into a fraction

📏

Mark a square root on the number line

🪐

Write and simplify in scientific notation

✅Rational numbers

Can be written as \( \frac{a}{b} \)

The decimal stops or repeats

\( \frac{5}{8} \), \( -7 \), \( 0.\overline{3} \)

🚫Irrational numbers

Cannot be written as \( \frac{a}{b} \)

The decimal neither stops nor repeats

\( \sqrt{2} \), \( \sqrt{7} \), \( \pi \)

The notes are free to read in full.

Presenter notes: Today we sort numbers into two families and learn a short way of writing very large and very small numbers.