Maths for Kids 16

measurement
Measurement






Label : Maths for Kids , Maths Puzzle , Brain Tester ,  Maths Question , Puzzle for kids
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LCM and HCF problem

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Question : There are three numbers such that the product of the first two numbers is 91                  and that of the last two numbers is 221. Find all three numbes and their sum Answer : Suppose numbers are A , B AND C. Also given   A x B  = 91 and B x C = 221 Since the numbers are prime number, they contain only 1 as the common factor. Also, above two products have B in common. So, B = H.C.F. of ( 91 and 221 ) = 13; A  = 91/13 = 7;  C  = 221/13 = 17. Required sum = (7 + 13 + 21 ) = 41. ================================================================= Question : The ratio of two numbers is 3 : 4. The L.C.M. of two numbers is 48.                   Find sum of the number Solution : Let the numbers be 3x and 4x. Then, their L.C.M. = 12x. So, 12x = 48 or x = 4 The numbers are 12 and 16. Hence, required sum = (12 + 16) = 28. ================================================================ Important points regarding LCM and HCF m
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Maths Olympiad : Puzzles

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Question : Albert and Bernard just become friends with Cheryl , and they want to know her birthday is .Cheryl gives them a lsit of 10 possible dates May 15                       May 16                        May 19 June 17                       June 18 July 14                        July 16 August 14                   August 15                  August 17 Cheryl then tells Albert and Bernard separately the month and day of her Birthday respectively Albert : I do not know when Cheryl's birthday is , but I know that Bernard does not know too. Bernard : At first I do not know when Cheryl's birthday is , But I know now. Albert : Then I also know when Cheryl's birthday is So when is Cheryl's birthday is Answer : July 16 Solution :   From first statement of Albert is is clear that birthday is in either July or August months   From Bernard statement it is clear that day is not 14, so left out options are July 16 , August 15 and August 17 Now as Albert
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Maths For Kids Grade 6

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Question : 1) The sum of the prime factor of 63 ? 2) How many right angles are there in 4 complete turns ? 3) If ( K - 8 ) is the HCF of 56 and 84 , then the value of K? 4) Complete the series  1 , 4  , 2  , 8  , 6 , 24 , 22 , 88 , __ ? 5) If one third of the tank hold 60 litres of water , then the quantity of water that half of the tank holds 6) Five electronics devices make a beep after every 30 minutes , 45 minutes , 1 hour 10 minute , 1 hour 15 minutes and 1 hour 45 minutes respectively . If all the devices beeped together at 10 O'clock then will together at what time ?   ( Clue : Find LCM ) 7) How many minimum squares must be shaded to make the given figure symmetric ? 8) Find the Area  and Perimeter of the given figure 9) Express 15 seconds as a percentage of 4 minutes 15 seconds 10)  Find the lowest number which when divided by 112 , 140 and 160 leaves a remainder 5 in each case ( clue LCM + 5 ) 11) A , B and C walk around a circular path . Their
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