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Class 9 Maths 1: Number Systems Ex 1.3 Solutions

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Exercise 1.3 Solutions (рдк्рд░рд╢्рдиाрд╡рд▓ी 1.3)

Q1: Write in decimal form and say what kind of decimal expansion each has.
(рджрд╢рдорд▓рд╡ рд░ूрдк рдоें рд▓िрдЦिрдП рдФрд░ рдмрддाрдЗрдП рдХि рдк्рд░рдд्рдпेрдХ рдХा рджрд╢рдорд▓рд╡ рдк्рд░рд╕ाрд░ рдХिрд╕ рдк्рд░рдХाрд░ рдХा рд╣ै।)

(i) 36/100 = 0.36 (Terminating / рд╕ांрдд)
(ii) 1/11 = 0.0909... = 0.09̄ (Non-terminating repeating / рдЕрдирд╡рд╕ाрдиी рдЖрд╡рд░्рддी)
(iii) 4 1/8 = 33/8 = 4.125 (Terminating / рд╕ांрдд)

Q3: Express the following in the form p/q.
(рдиिрдо्рдирд▓िрдЦिрдд рдХो p/q рдХे рд░ूрдк рдоें рд╡्рдпрдХ्рдд рдХीрдЬिрдП।)

(i) 0.6̄
Let x = 0.666... (Eq 1)
Multiply by 10: 10x = 6.666... (Eq 2)
Eq 2 - Eq 1: 9x = 6 ⇒ x = 6/9 = 2/3

(iii) 0.001̄
Let x = 0.001001... (Eq 1)
Multiply by 1000: 1000x = 1.001001... (Eq 2)
Eq 2 - Eq 1: 999x = 1 ⇒ x = 1/999


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