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4th Class

Safety and First Aid

  Safety and First Aid   Synopsis  
Tit Bits
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Catgeory: 4th Class

Our Clothes

  Our Clothes   Synopsis  
Tit Bits
 
Linen is a fibre that is obtained from the stem of the flax plant.
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Catgeory: 4th Class

Air, Water and Weather

  Air, Water And Weather   Synopsis  
Tit Bits
When water boils, the bubbles that are seen bursting on the water are not air bubbles. more...
Catgeory: 4th Class

­­­Our Universe

  Our Universe   Synopsis  
Tit Bits
From the earth, stars seem to twinkle because the light from the stars is affected by the different layers of wind in the more...
Catgeory: 4th Class

Matter

  Matter   Synopsis    
Tit Bits
Gases are the substance in which the particles are very loosely packed and can compressed. Gases like LPG and CNG are compressed in cylinders and are used as fuels.
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Catgeory: 4th Class

Force, Work and Energy

  Force, Work and Energy   Synopsis   more...
Catgeory: 4th Class

Large Numbers

  Large Numbers   Synopsis  
  • The ten digits in the number system are 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.
  • 0 is the smallest 1 - digit number and 9 is the largest 1 -digit number.
 
Tit Bits
Renewable sources of energy are those that are renewed naturally. For example, solar energy, wind energy and water energy.
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Catgeory: 4th Class

Roman Numerals

Roman Numerals   Synopsis          Rules for writing Roman Numerals:   (a) If a smaller numeral is written after a larger numeral, their values are added. e.g.,     (b) If a smaller numeral is written before a larger numeral, its value is subtracted from that of the larger numeral. e.g.,   (c) Repetition of a numeral means addition.   more...
Catgeory: 4th Class

Addition and Subtraction

Addition and Subtraction           Synopsis  
  • Addition:
    • When two numbers are added, each of them is called an addend and the answer obtained is called the sum.
    e.g.,  
    No. of digits Smallest Counting Number Largest Counting Number
    1 1 9
    2 10 99
    3 100 999
    4 1000 9999
    20165 + 9312 = 29477
    Addend   Addend   Sum
      Properties of addition:  
    • Two numbers added in any order give the same sum.
    e.g., 4126+3143 =7269 Also, 3143+4126 =7269
    • When one of the addends is 0, the sum is the addend other than 0.
    e.g., 6740 + 0 = 6740 In more...
    Catgeory: 4th Class

    Multiplications and Division

    Multiplications and Division   Synopsis  
  • Multiplication:
    • Multiplication is repeated addition of the same number.
    e.g., \[\text{15}+\text{ 15 }+\text{ 15 }+\text{ 15 }=\text{ 4}\times \text{15}\]
    • In a multiplication, the number that is multiplied is called multiplicand, the number by which it is multiplied is called multiplier and the answer obtained is called result or
     
    e.g., more...
    Catgeory: 4th Class

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