Common Mathematical Formulas for Classes 7 and 8

Mathematical formulas are important components in teaching and learning mathematics. These formulas provide a computation roadmap. In order to assist both teachers and learners, this note provides general mathematical formula and common units of measurements meant for classes 7 and 8. The formulas are expected to help students to solve questions easily and in a more effective way.

Length

The units of length that are used include the following:

• millimetre        (mm)
• centimetre       (cm)
• decimetre        (dm)
• Metre               (m)
• Dekametre       (Dm)
• Hectometre     (Hm)
• Kilometre        (Km)

Mass

• 1000 g             =         1Kg
• 1000 Kg          =         1Tonne
• 1000000 g        =         1Tonne

Volume and Capacity

• 1 cm3                     =         1 Ml (millilitre)
• 1000 cm3          =         1 L (litre)
• 100 cm3                 =        1 dl (decilitre)
• 1 m3                 =         1000 litre
• 1000000 cm3   =         1 m3
• 10 dl                =         1 Litre
• 1000ml             =         1 Litre

Time

• 60 Seconds      =          1 Minute
• 60 Minutes      =          1Hour
• 3600 Seconds  =          1 Hour
• 24 Hours         =          1 day
• 7 Days            =           1 Week

Area

a) Rectangle

Area      =       Length x Width

A           =       L X W

b) Square

Area     =    Side x Side

A         =     S x S

A         =      S2

c) Parallelogram

A        =         base x Height

A        =          b x h

d) Rhombus

Area    =         base x height

A         =         b x h

Full Copy

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