SQUARES AND SQUARE ROOTS Square number - The square of a number is the product of the number with the number itself. A given number is a perfect square if its prime factors can be expressed in pairs of equal factors. A perfect square number is never negative. For example - 8^2 = (8×8) = 64 Facts About Squares - 1. A number ending in 2, 3, 7 or 8 is never a perfect square. 2. A number ending in an odd number of zeros is never a perfect square. 3. The square of an even number is always even. 4. The square of an odd number is always odd. 5. The ending digits of a square number is 0, 1, 4, 5, 6, or 9 only. Note:- It is not necessary that all numbers ending with digits 0, 1, 4, 5, 6, or 9 are square numbers. Important Facts- 1. Numbers ending in an even number of zeros are not necessarily perfect squares. Eg- 3700, 290000, 47000000. Practice Questio...
Learn them and write in your notebook to learn English Easily. Helpful for exams. Collective Nouns 1. A galaxy of stars 2. An army of soldiers 3. A bouquet of flowers 4. A band of musicians 5. A range of hills 6.A batch of boys 7. A Grove of trees 8. A bundle of sticks 9. A swarm of ants 10. A bunch of keys or bananas 11. A flight of stairs 12. A bunch of grapes or flowers 13. A troop of horseman 14. A class of students 15. A team of players or bullocks 16. A catalogue of books 17. A party of friends 18. A crowd of people 19. A series of events 20. A flock of sheep, birds or goats 21. A nests of birds 22. A group of persons 23. A crew of sailors 24. A gang of robbers or thieves 25. A heap of sand 26. A shower of rains 27. A hive of bees 28. A choir of singers 29 A herd of cattle, sheep o...
CHEMICAL FORMULAS The chemical formula of a compound is a symbolic representation of its chemical composition. Name of the Compound Formula Sodium hydroxide NaOH Phosphorus pentachloride PCl 5 Sulfur dioxide SO 2 Potassium bicarbonate KHCO 3 Methanol CH 3 OH Ammonium Carbonate (NH 4 ) 2 CO 3 Aluminium Oxide Al 2 O 3 Sodium oxide ...
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