SHREE BALAJI CLASSES

Are you ready to give your mathematics skills a boost? These simple math tricks can help you perform calculations more quickly and easily. They also come in handy if you want to impress your teacher, parents, or friends. 01 The Answer Is 2 Think of a number. Multiply it by 3. Add 6. Divide this number by 3. Subtract the number from Step 1 from the answer in Step 4. The answer is 2. Same Three-Digit Number Think of any three-digit number in which each of the digits is the same. Examples include 333, 666, 777, and 999. Add up the digits. Divide  the three-digit number by the answer in Step 2. The answer is 37. Six Digits Become Three Take any three-digit number and write it twice to make a six-digit number. Examples include 371371 or 552552. Divide the number by 7. Divide it by 11. Divide it by 13. The order in which you do the division is unimportant! The answer is the three-digit number. Examples: 371371 gives you 371 or 552552 gives you 552. A related trick is to take any three-di...

               Five Amazing Forests in the World 1. Crooked Forest, Poland This grove of oddly-shaped pine trees just outside Nowe Czarnowo, West Pomerania, is a man-made wonder, but nobody is quite certain how or why. Some believe that some sort of tool or technique was used when they were planted in the 1930s so that they could be used in ship building. Others speculate that the young saplings were crushed by tanks during the Second World War and that’s what made them grow this way. Whatever the reason, the result is one of the strangest forests you are ever likely to see. 2. Monteverde Cloud Forest Reserve Named after the nearby town of Monteverde, this 26,000 acre forest reserve sits high in Costa Rica’s legendary cloud forests. The Reserve consists of 6 ecological zones, 90% of which are virgin forest. With over 2,500 plant species (including the most orchid species in a single place), 100 species of mammals, 400 bird species, 120 rept...

                             Five Amazing Rivers of the World Rivers are the lifelines of the human civilization. They have been of great importance in the history of mankind, because ancient civilizations arose and flourished on the banks of mighty rivers in various parts of the world.      Great rivers have witnessed the growth of cities, rise and fall of empires and political and cultural movements on their banks. Rivers are the bedrock on which our civilizations are built. 1. Nile River : When you think of the River Nile, the first place that comes to your mind Egypt. Though only about one fourth of the Nile runs through Egypt, the two are concerned in a special way.         The River Nile is 6650 km long, and is the longest river in the world. It is formed from the White Nile, which originates at Lake Victoria and the Blue Nile, which orig...

    In the cycle of life, predators always occupy an important position. They are killers. But they kill, only to 'kill' their hunger. In fact, the story of the animal kingdom is full of predators trying to catch prey, and the prey trying to outwit predators. It is the balance between the two that takes the drama of life forward. In the wild, there is no place for the weak, whether it's the predator or the prey, and only the fittest survives. The hunters keep populations healthy by weeding out the old and the sick. Of course, there are also creatures that steal the prey caught by others, like hyenas.      We have collected information about some animals for which you must know. 1 . Bengal Tigers : The Bengal Tiger is found in the rainforests and grasslands of Bangladesh, Bhutan Burma, China, India and Nepal. Bengal tigers are extremely large, and the males are up to 3 meters in length. The Bengal tiger's fur is orange brown, with black stripes. It hunts deer,...

We have to look at the numbers from 1 to 9.      Cube of 1 (1 3 )  =        1 Cube of 2 (2 3 )  =        8 Cube of 3 (3 3 )  =      27 Cube of 4 (4 3 )  =     64 Cube of 5 (5 3 )  =  125 Cube of 6 (6 3 )  =  216 Cube of 7 (7 3 )  =  343 Cube of 8 (8 3 )  =  512 Cube of 9 (9 3 )  =  729      Cube of 10 (10 3 )=1000 Some important things:- 1.      The sum of the digits of a perfect cube number can only be 1, 8 and 9, so if the sum of the digits is any other than these three, then that number cannot be a perfect cube. 2.      The numbers to the right of which zeros are not multiples of three are incomplete cube numbers like 100, 10000, 2160000 etc. 3.      As many groups of 3–3 digits are formed in a perfect cube number, there will be as ma...

1.     We have to look at the numbers from 1 to 9.      Square of 1 (1 2 )=    1 Square of 2 (2 2 )=    4 Square of 3 (3 2 )=    9 Square of 4 (4 2 )= 16 Square of 5 (5 2 )= 25 Square of 6 (6 2 )= 36 Square of 7 (7 2 )= 49 Square of 8 (8 2 )= 64 Square of 9 (9 2 )= 81 2.      From this we can infer that Square root of any number which ends with 1 will end with 1 or 9 (1+9=10). Square root of any number which ends with 4 will end with 2 or 8 (2+8=10). Square root of any number which ends with 9 will end with 3 or 7 (3+7=10). Square root of any number which ends with 6 will end with 6 or 4 (6+4=10). If the square ends in         1        4        9        6         5   ...