Q4. Check whether 4n , where n is a natural number , can end with the digit 0 for any natural number n.
Q5. The length , breadth and height of a room are 8m 25cm, 6m 75cm & 4m 50cm, respectively Find the length of the longest rod that can measure the three dimensions of the room exactly
Q6. If HCF ( 28,35 and 343)=7 , find the LCM (28,35 and 343)
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1) 4n can only end with 0 when n is multiple of 5.
2) length = 8m 25 cm = 825 cm = 5x5x3x11
breadth = 6m 75 cm = 675 cm = 5x5x3x3x3
height = 4m 50 cm = 450 cm = 5x5x2x3x3
lcm of (825 , 675, 450) = 5x5x3x3x3x2x11 = 14850 cm is the length of the rod.
3) 28 = 2x2x7
35 = 5x7
343 = 7x7x7
lcm = 2x2x5x7x7x7 = 6860
hope this helps.
2) length = 8m 25 cm = 825 cm = 5x5x3x11
breadth = 6m 75 cm = 675 cm = 5x5x3x3x3
height = 4m 50 cm = 450 cm = 5x5x2x3x3
lcm of (825 , 675, 450) = 5x5x3x3x3x2x11 = 14850 cm is the length of the rod.
3) 28 = 2x2x7
35 = 5x7
343 = 7x7x7
lcm = 2x2x5x7x7x7 = 6860
hope this helps.
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