Note: * means multiply
Here are some key words to look for: 'plus' means +, 'times' means *, 'a number' is 'x' (or some variable), 'is less' is <, 'of' means multiply (similar to 'times'). Putting all this together, we get:
Two plus three times a number is less than one-half of the number
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2 + 3 * x < 1/2 * x
So we then get: 2+3x<(1/2)x
note: I removed the asterisks since 3x means 3*x
So the translated inequality is
So I would get familiar with all the key words (there are many more) to help you in the translations.