 These are some questions that are often asked of our staff. Just click on the question to see the answer.

Is "twice bigger" the same as double?

How to interpret mathematical problems?

How do I round a number?

How do you calculate square root "in hand"?

How much is zero high worth at zero power?

Is it possible to divide a number by zero?

How is the CPF check digit calculated?

How does the nines out rule work?

Why are fractions called proper, improper, and apparent?

What does "ceviana" mean?

Why is every number raised to exponent zero equal to 1?

How many decimal places does pi have?

What is the difference between arrangement and combination?

How does the sum symbol work?

What are triangles, rectangles, acutangles or obtusangles?

I can not understand functions. What do I do?

I want to know how to solve equations of the first degree.

If I have two sides and an angle of any triangle, is there any law that gives me that triangle easily?

How is x2-6x = 0 becomes x (x-6) = 0? Where did the "x" of "6x" end up?

How do you make a simple and compound three rule?

What rules should I use to resolve numeric expressions?

How to turn Km to meters or the reverse? Can't know where to put the comma?

What is the area of ​​a cylinder? And from a half circle?

How to classify a triangle as to SIDES? What is an equilateral triangle? And an isosceles? And a scalene?

How do I measure the length of a circumference? How do I calculate a diameter? What is the radius of the circumference?

I am doubtful of a factoring rule by placing a common factor in evidence. I want to know what signal should be highlighted along with the common factor.

I can't take these faucet issues anymore! Tell me how I solve this: A reservoir is powered by two taps that fill it in 6 h. If the first, alone, fills it in 10h, how long will the second, working alone, leave the reservoir full?

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