2006-10-31 10:30:32 · 4 answers · asked by fi fi 1 in Science & Mathematics ➔ Mathematics
60
2006-10-31 11:22:14 · answer #1 · answered by davidosterberg1 6 · 1⤊ 0⤋
In order to find the multiples in common, start with the prime numbers less than the starting numbers:
2, 3, 5, 7, 11, and 13
Extra hints:
Numbers that factor with 2 always end in even numbers.
Numbers that factors with 3, you can add up the digits and if it is divisible by 3 it has 3 as a factor (e.g. 12 1+2=3 therefore it is factorable by 3).
Numbers with 5 as a factor always end in 5 or 0.
After that, start dividing by the available prime numbers.
2006-10-31 19:01:06 · answer #2 · answered by lisaleeschaefer 1 · 1⤊ 0⤋
List the multiples possible like this:
20 15
40 30
60 45
80 60
60 is on both lists, so the answer is 60
2006-10-31 20:17:27 · answer #3 · answered by piguyfun 2 · 0⤊ 0⤋
60 but, dont make people do your math. u should learn try hotmath.com
2006-10-31 18:54:14 · answer #4 · answered by Sakura_Blossoms 2 · 1⤊ 1⤋