HCF and LCM- PART II


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HCF and LCM

HCF means Highest Common Factor: HCF of two or more numbers is the greatest number that divides each of them exactly. We are going to practice question like first simple, little bit tuff and more tuff. Tuff means the question takes more time for calculation that’s it ok. I will give some tips for quicker calculation methods also. Ex. 1 Find the HCF of 42 and 70             42 = 2x3x7             70 = 2x5x7  HCF = 2x7=14                         Quicker method             70 - 42 =28             42 -28=14             28-14=14             14-14=0           HCF =14 Ex. 2 Find the HCF of 1365,1560 and 1755             1365=3x5x7x13             1560=2x2x2x3x5x13             1755=3x3x3x5x13      HCF=3x5x13=195 in this method we have to spend little bit more time  Quicker method          1560-1365=195             1755-1560=195           HCF = 195 HCF of decimals Rule first make (if necessary) the same number of decimal places in all g
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