Explain how knowing 50x4=200 helps you find 500x400

Mathematics

2 answers:

masya89 [10]3 years ago

4 0

50 times 4 is 200, so when you're trying to find what 500 times 400 is, you would keep the 200 and add 4 zeros from the remaining 0's in 500 and 400. I hope that's not too complicated, since this is elementary math.

enyata [817]3 years ago

4 0

Refer to this picture, it looks complex but it is really pretty easy, im in my last year of high school and i still use this trick to help me on questions like this!! (it will only work if the questions have the same numbers in them like how these two questions both have a 5, 4, and 2, to different places)

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miss Akunina [59]

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3 years ago

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I need to know the steps to simplify 15.7 + (-3.45)

faust18 [17]

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LUCKY_DIMON [66]

Answer:

The radius is 5 cm

Step-by-step explanation:

The formula for the area of a circle is : $\p*radius^2$

To work out the length of the radius you would first need to divide the area of 78.5 cm by pi (pi=3.14), this gives you $25cm^2\\$ . This is because by dividing the area by pi we are isolating the value of the radius squared.

The final step is to work out the radius. You can do this by finding the square root of the radius squared which is 25, this gives you 5 cm. This means that the radius is 5 cm. This is because the square root is a number that when squared equals that number.

1) Divide 78.5 by pi.

$78.5/\pi=25cm^2$