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Chapter 1: Real Numbers

FBISE / NBF · Class 9 Mathematics
12 topics in this chapter

Terminating and RecurringA terminating decimal stops after finitely many digits, such as 78 = 0.875.Method, examples & revision insideView Full Notes →
Laws of the Four OperationsOn the real numbers, addition and multiplication stay inside R: that is closure.Method, examples & revision insideView Full Notes →
Babylonian Base 60Babylonians used a sexagesimal system, which means base 60: sixty of one place make one of the next place.Method, examples & revision insideView Full Notes →
Roman Seven SymbolsRoman numerals use seven symbols I, V, X, L, C, D, M for 1, 5, 10, 50, 100, 500, 1000.Method, examples & revision insideView Full Notes →
Digits and Place ValueTen digits plus place value let you write any whole number.Method, examples & revision insideView Full Notes →
Sifr To EuropeBrahmagupta (about 628 AD) wrote rules for the symbol of nothingness, including how to treat it in calculation.Method, examples & revision insideView Full Notes →
Rational QAny integer over any non-zero integer is rational: 34, -52, 71.Method, examples & revision insideView Full Notes →
Irrational Q'sqrt(2) is not equal to ab for any integers a, b with b != 0.Method, examples & revision insideView Full Notes →
N, W, and ZNatural numbers N count from 1.Method, examples & revision insideView Full Notes →
The Number LineDraw a straight line, mark the origin 0, and choose a unit length.Method, examples & revision insideView Full Notes →
Equality and CancellationReflexive: a thing equals itself.Method, examples & revision insideView Full Notes →
Trichotomy and InequalityTrichotomy: a sits left of b, on b, or right of b on the number line, never two of those at once.Method, examples & revision insideView Full Notes →

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Chapter 2: LogarithmsNext →

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Next chapterCh 2: LogarithmsAll chaptersClass 9 MathematicsClass 9 notesMore subjectsChapter 2LogarithmsChapter 3Sets and RelationsChapter 4Factorization and Algebraic ManipulationChapter 5Linear Equations and InequalitiesChapter 6Trigonometry and BearingChapter 7Coordinate Geometry

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