Question

can you do it fast please​

Answer 1

Step-by-step explanation:

1st question =the l. c. m of 21 and 30 by prime factorization method is

3{21, 30}

2{7, 10}

{7, 5}

the multiples are 3 ×2×7×5=210

therefore the lcm is 210

2nd question is

the l. c. m of 34 and 56 is

2{34,56}

7{17, 28}

2 {17, 4}

{17, 2}

the l. c. m is equal to 2×7×2×17×2=952

therefore the l. c. m is 952

B) the l. c. m of 32 , 40and 52 is

2{32, 40,52}

2{16, 20,26}

2{8, 10,13}

2{4, 5,13}

{2, 5,13}

the l. c. m of 32, 40, and 52 is equals to 2×2×2×2×2×5×13=2080

3 rd question

the relation between h. c. f and l. c. m is equals to

h. c. f (a, b) ×l.c.m (a, b) =a×b

lc. m is equal to90