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solmaris [256]
2 years ago
15

What do you need to do to add and subtract decimals?

Mathematics
2 answers:
olga nikolaevna [1]2 years ago
6 0

Answer:

Write down the numbers, one under the other, with the decimal points lined up

Put in zeros so the numbers have the same length

Then add using column addition, remembering to put the decimal point in the answer

Step-by-step explanation:

Elza [17]2 years ago
6 0
Line up decimals and add/subtract no different then when you’re adding and subtracting normal numbers
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Simplify the expression:<br>15 + 3(2 + 8) - 42​
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8x+11=14-1x how does it work
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Answer:

x = 1/3

Step-by-step explanation:

Step 1: Write equation

8x + 11 = 14 - 1x

Step 2: Solve for <em>x</em>

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Step 3: Check

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Mia and holly can clean their room in 20 minutes, working together. Working alone, mia can clean the room in 30. How long would
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Answer:  Holly would take 60 minutes to clean alone.

Step-by-step explanation:

Let t = Time taken by Holly to clean alone.

Given: Time taken by Mia to clean alone = 30 minutes

Time taken by Mia and holly to clean their room = 20 minutes

Then,

\dfrac1t+\dfrac{1}{30}=\dfrac{1}{20}\\\\\Rightarrow\ \dfrac{1}{t}=\dfrac{1}{20}-\dfrac{1}{30}\\\\\Rightarrow\ \dfrac{1}{t}=\dfrac{3-2}{60}\\\\\Rightarrow\ \dfrac{1}{t}=\dfrac{1}{60}\\\\\Rightarrow\ t= 60

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3 years ago
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