hey can u give me the...?

Question

Lowest Common Multiple (LCM) for these numbers:
[numbers that are in my book]
18) 2,15
20) 15,7
21) 4,3
22)6,9
24) 4,6
26) 6,8
28) 3,11
30) 88,4

THANKS!

Answer 1

18) 30 20)105 21) 12 22) 18 24) 12 26) 24

28) 33 30) 88

Answer 2

Lowest Common Multiple
The smallest common multiple of two or more numbers is called the lowest common multiple (LCM).
E.g. Multiples of 8 are 8, 16, 24, 32, …
Multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, …

That means if you multiply the two together you have one possibility. However, if both of them can be divided by the same number then you can reduce that number.

18)
2,4,6,8,10,12,14,16 -18,20,22,24,26,28.30
15, 30
so 30 is the LCM

20)
15,30,45,60,75,90,105
7,14,21,28,35,42,49- 56,63,70,77,84.91.98.105
so 105 is the LCM

21)
4,8,12
3,6,9,12
12 is LCM

Do you see the pattern. Just multiply the top number times 1, 2, 3, 4, etc. until you get a number that is the same as when you multiply the bottom by 1, 2, 3, 4, etc.

22)
6,12,18
9.18
18 is LCM

24)
4,8,12
6,12
12 is LCM

26)
6,12,18,24
8,16,24
24 is LCM

28)
3,6,9,12,15,18- 21,24,27,30,33
11,22,33
33 is LCM

30)
88
4,8,12,16,20,24,28,32- 36,40,44,48,52,56,60,64- 68,72,76,80,84,88
88 is LCM

Answer 3

18) 15*1=15 not evenly divisible by 2, so keep going: 15*2=30
20) 15*3=45 15*4=60 15*5=75 15*6 = 90 15*7=105
21) 4*1=4 4*2=8 4*3=12
22) 9*1=9 9*2=18
24) 6*1=6 6*2=12
26) 24
28) 33
30) 88

Answer 4

18)30
20)105
21) 12
22) 18
24) 12
26) 24
28) 33
30) 88

fyi odd numbers have answers in the back of the book and next time do your own work

Answer 5

You SHOULD do your own homework, but oh well.

18) 30
20) 105
21) 12
22) 18
24) 12
26) 24
28) 33
30) 88