Playing With Numbers
ICSE · Class 8 · Mathematics
All formulas from Playing With Numbers in ICSE Class 8 Mathematics. Key equations, constants, and identities for board exam preparation.
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Formulas
Generalized Form and Place Values
3479 = 3 × 1000 + 4 × 100 + 7 × 10 + 9 × 1
abc = 100a + 10b + c
ab = 10a + b
Properties of Numbers and Digits
ab + ba = 11(a + b)
ab - ba = 9(a - b); ba - ab = 9(b - a)
abc + bca + cab = 111(a + b + c)
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