P1 - Introduction fractions

Introductions to Fractions

When we write fraction in words, we need to pay attention to this:

• Numerator uses cardinal number, such as: one, two, three, four, five, and so on.

• Denominator uses ordinal number, such as: third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, and so on.

Multiple Select

Choose all the cardinal numbers.

• two

• third

• three

• four

• fifth

Multiple Select

Choose all the ordinal numbers.

• third

• four

• fifth

• fourth

• six

Special fraction:

• For 1/2 we don't say it as one-second, but

   $\frac{1}{2}\ =\ half$  

• For 1/4 we can say it as one forth or a quarter

How do we say this fraction?

One half

How do we say this fraction?

two halves is equal to one

Quarter

•   $\frac{1}{4}\ =\ one-forth\ or\ a\ quarter$  
  

•  $\frac{2}{4}\ =\ two-forths\ or\ two\ quarters$ 
  

•  $\frac{3}{4}\ =\ three-forths\ or\ three\ quarters$  

How do we say this fraction?

One fourth or one quarter

How do we say this fraction?

Two quarters

How do we say this fraction?

Two quarters or one half

How do we say this fraction?

Three quarters

How do we say this fraction?

Four quarters or one

How do we say this fraction?

One third

How do we say this fraction?

Two thirds

How do we say this fraction?

Three thirds is equal to one