Topic Details (Notes format)

How to Round Numbers (Nearest Whole, Tenth, Hundredth)

Subject: Mathematics

Book: Maths Mastery

Rounding numbers helps to simplify data interpretation, especially when dealing with lengthy decimals or when exact precision is not essential. The core principle: if the digit to the right of your rounding place is 5 or more, you round up; otherwise, you round down. For instance, to round 3.678 to the nearest tenth, look at the hundredths digit (7); since it’s ≥ 5, 3.678 becomes 3.7. Similarly, rounding 3.678 to the nearest hundredth yields 3.68. Rounding is widely used in financial transactions (rupee/cents rounding), scientific measurements, and everyday approximations for easier communication and calculation.

Practice Questions

What is the LCM of 15 and 20?

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What is the value of log₃(27)?

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If x^2 - 5x + 6 = 0, what are the roots?

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If the average of five consecutive odd numbers is 25, what is the largest number?

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What is the HCF of 48 and 180?

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A triangle has angles 60°, 60°, and 60°. What type of triangle is it?

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What is the cube root of 729?

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What is the length of the diagonal of a square with a side length of 7 cm?

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If sin(θ) = 3/5 and θ is an acute angle, what is tan(θ)?

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If the sum of the angles of a polygon is 1080°, how many sides does the polygon have?

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