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Unit: Number System
Chapter: Rounding Off Numbers & Roman Numerals
Reference: – Rounding Off to Nearest Tens, Hundreds, Thousands, Rules of Rounding (5 or More Round Up, 4 or Less Round Down), Roman Numerals (Symbols I, V, X, L, C, D, M), Rules of Roman Numerals (Addition & Subtraction), Repetition Rules, Subtractive Notation, Converting Roman Numerals to Hindu-Arabic Numerals
After studying this chapter, you should be able to understand:
- Rounding Off Numbers to Nearest Tens, Hundreds, Thousands
- Rules of Rounding (5 or More Round Up, 4 or Less Round Down)
- Roman Numerals & Their Basic Symbols
- Rules of Roman Numerals (Addition & Subtraction)
- Repetition and Subtractive Notation Rules
- Converting Between Roman and Hindu-Arabic Numerals
Rounding off Numbers
Rounding off anumber to nearest tens
When we round off the units place it is called estimating a number to nearest tens.
- If the number at units place is below 5, it is rounded off to 0 i.e. the lower tens.
- If the number at units place is greater than or equal to 5, it is rounded off to 10.
Examples
(i) 88 is rounded off to the nearest ten as 90
(ii) 34 is rounded off to the nearest ten as 30
(iii) 12 is rounded off to the nearest ten as 10
Rounding Chart for Nearest Tens
Source: Kapdec.com
Rounding off a number to nearest hundreds
When we round off the tens place it is called estimating a number to nearest hundreds.
- If the number at tens place is below 5, it is rounded off to 0.
- If the number at tens place is greater than or equal to 5, it is rounded off to 100.
Examples –
(i) 321 is rounded off to the nearest hundred as 300
(ii) 579 is rounded off to the nearest hundred as 600
(iii) 452 is rounded off to the nearest hundred as 500
Rounding Chart for Nearest Hundreds
Source: Kapdec.com
