Question

l c m of 15 20 and 90 please help me fast

Answer 1

180 is your answer......

Answer 2

Hi.

QUESTION

LCM OF 15, 20, and 90 ❓

SOLUTION

✏ LET US FIRST CONSIDER,

15 AND 20,

LCM OF 15 AND 20

==> PRIME FACTORS OF 15 = 3,5

AND

PRIME FACTORS OF 20 = 5,2,2 = 5 X 2²

PRIME FACTORS OF 90 = 5,3²,2

NOW, CHOOSE THE UNCOMMON PRIME FACTOR,

THEY ARE 3,5,2

NOW, WRITE THESE PRIME FACTORS WITH THEIR GREATEST EXPONENTS.

THAT IS

==> 5¹, 2², 3²

HENCE,

LCM OF 15,20, 90 IS

==> 5 X 2 X 2 X 3 X 3

==> 180

HOPE IT HELPS YOU.