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GuDViN [60]
3 years ago
11

How do you subtract fractions with different denominators?

Mathematics
2 answers:
Vera_Pavlovna [14]3 years ago
6 0
You find a common denominator, for example, if you want to subtract 3/4 minus 1/2 you would have to multiply 1/2 by 2/2, which equals 2/4, then you can do 3/4-2/4, which is 1/4. Sorry if it’s a bit confusing, hope it helps!
klio [65]3 years ago
6 0

Answer:

When solving fractions with different denominators, you first need to make the denominators the same.

Example:

\frac{1}{2} -\frac{1}{4}

You need to make sure the denominators are the same.

Can 2 get multiply by something and will be 4?

The answer is yes, if you multiply 2 by 2, it will change the 2 to 4. You have to multiply the equation \frac{1}{2} by  \frac{4}{4} (which is also equivalent to 1) and which change the equation to \frac{2}{4}.

And now you can subtract because the denominators are the same.

Hope this helps!

If you have any questions feel free to ask.

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Does the bathroom have enough water and shampoo for 888 long-haired members and 777 short-haired members?
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Complete question :

Members of the swim team want to wash their hair. The bathroom has less than 5600 liters of water and at most 2.5 liters of shampoo. 70L+ 60S < 5600 represents the number of long-haired members L and short-haired members S who can wash their hair with less than 5600 liters of water. 0.02L + 0.01S < or equal to 2.5 represents the number of long-haired members and short-haired members who can wash their hair with at most 2.5 liters of shampoo. Does the bathroom have enough water and shampoo for 8 long-haired members and 7 short -haired members?

Answer:

Yes , there is enough water and shampoo

Step-by-step explanation:

Given that:

Number of long and short hair member who can wash their hair with less than 5600 litres of water.

70L+ 60S < 5600

Number of long and short hair member who can wash their hair with at most 2.5 litres of shampoo

0.02L + 0.01S ≤ 2.5

To check if bathroom has enough water and shampoo for 8 long haired and 7 short haired members.

Water check:

70L+ 60S < 5600

L = 8 ; S = 7

70(8) + 60(7) < 5600

560 + 420 < 5600

980 < 5600

Inequality constraint is satisfied ; There is enough water.

Shampoo check:

0.02L + 0.01S ≤ 2.5

L = 8 ; S = 7

0.02(8) + 0.01(7) ≤ 2.5

0.16 + 0.07 ≤ 2.5

0.23 ≤ 2.5

Inequality constraint is satisfied ; There is enough shampoo

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Answer:

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Step-by-step explanation:

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