Formulas :

Numerator = ( __ x __ x __ ) + ( __ x __ x __ ) + ( __ x __ x __ )

Denominator = __ x __ x __

Example :

²/₃+ ¹/₄ + ³/₅

Numerator = (2 × 4 × 5) + (1 × 3 × 5) + (1 × 3 × 4)

= (40 + 15 + 12)

= (67)

Denominator = 3 × 4 × 5

= 60

So, ²/₃ + ¹/₄ + ³/₅ = ⁶⁷/₆₀

Formulas :

( __ + __ ) ÷ 2 × ( __ − __ + 1)

Example :

(20 + ... + 35)

(20 + 35) ÷ 2 × (35 − 20 + 1)

55 ÷ 2 × 16

So, (20 + ... + 35) = 440

Formulas :

Numerator = ( __ x __ ) + ( __ x __ )

Denominator = __ x __

Example :

³/₄ + ²/₅

Numerator = ( 3 x 5 ) + ( 2 x 4 )

= 23

Denominator = 5 x 4

= 20

So, ³/₄ + ²/₅ = ²³/₂₀