At every stage of your career, your priorities change in your research writing. If after initially completing the training, you wish to take any select lessons from this training in future, visit the link ‘Lesson-based Learning’ on our website www.p3r.in or write to us at [email protected], and look for lesson- based learning options. Module 1: Introduction to Scientific Communication Lesson 4: Quantitative and Numerical Expressions How to write number in scientific writing The way in which numbers are written can impact the interpretation of a sentence. You need to follow the rules, mentioned in the table below while writing numbers in scientific writing: Rule name Example Word form of numbers Three out of seven samples turned red. Plural form of numbers We interviewed people who had retired in the 1980s. Numbers in lists Twenty-five species of bacteria, fifteen species of fungi and two species of algae. Hyphens in numbers Forty-two samples were discarded. Measurements or calculations We dissolved 6 µg of sample in 1 ml of distilled water. Fractions The anomaly was limited to two-thirds of the total population. Ratios The ratio of producers to non-producers was 12:7. Dates Dolly, the first cloned mammal, was born on 5 July 1996. Numerical ranges We added sample A in columns 1 – 4 and sample B in columns 5 – 8. Very large or very small numbers The number of molecules was 3.12 × 1011. Percentages Thirty-three percent to thirty-nine percent of the animals typically are non-inhalers. Mathematical symbols It is a function of sin θ. Mathematical formulas If x is a real number, then x2 ≥ 0. Module 1: Introduction to Scientific Communication