i have 1/5 + 1/4 and i dont know how to answer it! please explain!!!
2007-03-17 23:02:29 · 6 answers · asked by Carly 2 in Education & Reference ➔ Homework Help
1/5 and 1/4 same denominator is 20. For 1/5 you had to multiply X 4 to get 20. So you have to multiply 4 X's the numerator. For 1/4 you had to multiply 4 X's 5 and you have to multiply 5 times the the denominator. So the answer would be : 9/20. Hope this helps!!!
2007-03-18 02:41:17 · answer #1 · answered by Anonymous · 0⤊ 0⤋
well you start by making the Denominator( the lower number of the fraction) the same. You do this by finding the least comming denominator LCD.
So the bottom number are 4 and 5.
muliply the 1/5 by 4 and the 1/4 by 5:
1 4 4
------- x -------- = --------
5 4 20
1 5 5
------- x -------- = --------
4 5 20
Than you add those two answers. The Denominator in your answer stays the same
5 4 9
------- + -------- = --------
20 20 20
2007-03-17 23:10:31 · answer #2 · answered by dreemz07 2 · 0⤊ 0⤋
You need common denominators before you can add fractions. Your denominators are 5 and 4. Find the least common multiple (LCM) of your denominators.
Multiples of 5: 5,10,15,20
Multiples of 4: 4,8,12,16,20
LCM is 20. 20 is your new denominator
Change 1/5 to a fraction with 20 as the denom.
1/5 = 4/20 5x4=20, so 1x4=4 (Whatever you do to the denominator, you must do to the numerator)
Change 1/4 to a fraction with 20 as the denom.
1/4= 5/20 4x5=20, so 1x5=5
4/20 + 5/20 = 9/20
2007-03-17 23:17:48 · answer #3 · answered by Michael D 2 · 0⤊ 0⤋
1/5 = 4/20
1/4 = 5/20
sum = 9/20
2007-03-17 23:16:42 · answer #4 · answered by Clive 6 · 0⤊ 0⤋
get a least common denominator which in this case is 20
1/5=4/20 multiply both by 4
1/4=5/20 multiply both by 5
answer is 9/20
2007-03-18 02:49:48 · answer #5 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋
1/5 + 1/4 =
change both to common denominator of 20
4/20 +5/20 =
now you are able to add numerators
9/20
2007-03-17 23:12:51 · answer #6 · answered by birdies 1 · 0⤊ 0⤋