LCM's : 25 and 63
32 and 15
HCF's : 65 and 23
52 and 35
56 and 18
P.S This is Homework so i need these answers by 12th Sep. 07!
2007-09-10 05:21:59 · 3 answers · asked by USMCGranty54 4 in Science & Mathematics ➔ Mathematics
LCM's :
25 and 63
= 1575
32 and 15
= 480
HCF's :
65 and 23 = 1
52 and 35 = 1
56 and 18 = 2
2007-09-10 05:29:17 · answer #1 · answered by harry m 6 · 0⤊ 0⤋
LCMs: Since 25 and 63 have no prime factor in common,
their LCM is 25*63 = 1575
Similarly the LCM of 32 and 15 is 32*15 =480.
General rule: LCM(a,b) = a*b/HCF(a,b)
HCFs: HCF(65,23) = 1
since 65 = 13*5 and 23 is prime.
HCF(52,35) = 1
since 52 = 2²*13 and 35 = 5*7
HCF(56,18) =2.
I'll let you figure out why!
2007-09-10 12:50:15 · answer #2 · answered by steiner1745 7 · 0⤊ 0⤋
LCM of 25 and 63 is 25 x 63 = 1575
The factors of 65 are 13 and 5; 23 is a prime number . Therefore HCF is only 1.
52 = 13x2x2; 35 = 7x5. Therefore HCF is only 1.
56 = 7x2x2x2; 18=3x3x2. Therefore HCF is 2.
2007-09-10 12:37:33 · answer #3 · answered by Eechhutti 2 · 0⤊ 0⤋