# A. If the length of one side of a square is 12.0m, what is the perimeter of the square?

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B. When numbers are very small or very large, it is convenient to either express the value in scientific notation and/or by using a prefix with the unit.

A pain-relieving pill has a mass of 0.005g. Express the pill’s mass in grams using scientific notation or in milligrams.

• A. 48 m because all sides are equal and you multiply 12 by 4.

B. 1 g = 1000 mg

___ _______

0.005 mg = x mg

Cross multiply.

x mg = 5 g

• Because a square has four sides of equal length, the perimeter is

12 m+12 m+12 m+12 m=48.0 m

• Squares have four sides of equal length, therefore:

Perimeter = 4 x 12 m = 48 m

0.001 g = 1 mg => 1 g = 1000 mg

Convert grams into milligrams by multiplying the value (in grams) by 1000, therefore:

0.005 g x 1000 = 5 mg

I hope I’ve helped you learn how to do any similar questions by yourself, not not just given you the answers 🙂

Source(s): A-level maths
• A.

P = 48 m

B.

0.005 g = 5 mg

• Use either an integer, decimal number, or scientific notation for the numeric portion of your answer. Do not use calculations or functions.

• 48m

5mg

• 48.0m

5g^-3

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