My daughter has a math question and we both have no clue how to do it. It says to find the common denominator for each pair of fractions, not least common, just common.
The first problem is 2/5, 1/3.
2006-12-11 11:09:54 · 10 answers · asked by rallenclnc 2 in Education & Reference ➔ Homework Help
its still going to be the least common denominator its just not specifiying that. so it would be 15 for 5 and 3 then you increase them to get 6/15ths and 5/15ths :-) i remember my mom helping me with homework, good luck have fun
2006-12-11 11:13:14 · answer #1 · answered by psychgirl731 2 · 0⤊ 0⤋
A fraction can stay equivalent if both the numerator and the denominator are multiplied by the same #.
The lowest multiple that the denominators share is 15, so we need to turn the denominators of each into 15.
For 2/5, we need to multiply both the top and the bottom by 3 to make the denominator 15, so now we have 6/15. For 1/3, we need to multiply both the top and the bottom by 5, so now we have 5/15.
2006-12-11 19:14:28 · answer #2 · answered by plasticglasses24 4 · 0⤊ 0⤋
you can multiply the bottom numbers together (5 and 3) <--
so 2/5 (*3)-this three comes from the bottom of 1/3
2/5 is 6/15 (2 times 3 is 6 and 2 times 3 is 6)
Now the other fraction 1/3 you multiply by 5 (this five comes from the bottom of 2/5)
so 1/3(*5) is 5/15
Your two fractions are 6/15 and 5/15. Notice how the bottom number of each fraction is 15. This is the common denominator.
2006-12-11 19:18:10 · answer #3 · answered by pumma81 3 · 0⤊ 0⤋
One of the easiest ways is to multiply them together. In this case you get 15ths.
Sometimes you can find a lower factor that is the LEAST common denominator, like when combining 1/8, 1/9 and 1/12. By multiplying you would get 864ths, but you could actually use 36ths. You find this out by looking at their common factors:
2*2, 3*3 and 2*2*3. So 2*2*3*3 should work for an LCD, which is 36ths, since 2*2*3*3 will accommodate all the factors listed.
2006-12-11 19:16:17 · answer #4 · answered by Anonymous · 0⤊ 0⤋
just multiply the bottom numbers of the pairs of fractions
2/5 and 1/3 would be 5 x 3 =15
2006-12-11 19:13:57 · answer #5 · answered by adam_adams_25 3 · 0⤊ 0⤋
2/5 mutiply this by 3/3= 6/15
1/3 mutiply by 5/5= 5/15
now use them.
2006-12-11 19:12:56 · answer #6 · answered by Anonymous · 0⤊ 0⤋
probably asking for teh least common denominator anyways, which is 15
2006-12-11 19:12:19 · answer #7 · answered by Anonymous · 0⤊ 0⤋
wouldn't you multiply 5x3 and get 15?
so 15 is your common denominator
2006-12-11 19:12:38 · answer #8 · answered by Agent99 5 · 0⤊ 0⤋
15 multiply the botems
2006-12-11 19:12:45 · answer #9 · answered by Anonymous · 0⤊ 0⤋
Ask your teacher, that's why he/she is the teacher!
2006-12-11 19:12:21 · answer #10 · answered by newyorkgal71 7 · 0⤊ 1⤋