Socho Ek Number: Jaadu Ka Raaz | Class 8 Maths Book 2 Ch 6

๐Ÿ“˜ Class 8 ยท Ganita Prakash Book 2Ch 6 ยท Algebra PlayPost 1 / 7โฑ 25โ€“30 min
Socho Ek Number: Jaadu Ka Raaz ๐ŸŽฉ

โœ… Pehle Yeh Aata Hai?

Yeh post shuru karne se pehle, in teen sawaalon ko 1 minute mein khud try kijiye:

  1. x ko double karo, kya likhoge?
  2. 2x + 4 ko 2 se bhaag do.
  3. (x + 2) โˆ’ x = ?
Answers dekho
  1. 2x
  2. x + 2
  3. 2

Teeno sahi? Waah, aap algebra ke jaadugar banne ko taiyaar ho! Letter-numbers yaad karne hon to Book 1 ka Ch 6 dekho.

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๐ŸŽฌ Kahani: Golu Ka Jaadu Show

Golu ne class mein elaan kiya: โ€œMain aapka dimaag padh sakta hoon!โ€ ๐ŸŽฉ

โ€œKoi bhi number socho. Use double karo. 4 jodo. 2 se bhaag do. Ab jo number socha tha, woh ghata do.โ€ Sab ne kiya. Golu bola: โ€œAap sabka jawab 2 hai!โ€

Sach mein sabka 2 aaya, chahe kisi ne 7 socha ya 1000! ๐Ÿ˜ฒ Priya ne kaha, โ€œYeh jaadu nahi, algebra hai.โ€ Chalo raaz kholte hain.

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๐Ÿ“– Concept: Letter-Number Se Har Number Ek Saath

Step 1: Socha number = x

Kisi bhi number ki jagah x likho. Ab har kadam x pe lagao:

Kadam7 sochax socha
Double142x
+ 4182x + 4
รท 29x + 2
โˆ’ socha number22

WHY 2? x + 2 โˆ’ x = 2. x gayab! Isliye jawab socha number pe nirbhar hi nahi.

Step 2: Jaadu ka niyam

Trick mein socha number kahin na kahin cancel ho jaana chahiye. Jo bachta hai, wahi โ€œjaadui jawabโ€.

Step 3: Jawab 3 ya 5 banaao

  • 4 ki jagah 6 jodo: 2x + 6 โ†’ x + 3 โ†’ 3.
  • 10 jodo: x + 5 โ†’ 5.

WHY? Double karke jo jodoge, aadha karne pe uska aadha bachega.

Step 4: Apni trick banao

ร— 3, + 9, รท 3, โˆ’ x: 3x โ†’ 3x + 9 โ†’ x + 3 โ†’ 3. Ya ร— 5, + 20, รท 5, โˆ’ x โ†’ 4.

Step 5: Jawab socha number pe nirbhar ho to?

Aakhir mein x na ghatao: ร— 2, + 10, รท 2 โ†’ x + 5. Dost jawab bataaye, aap 5 ghata ke uska socha number bata do! ๐Ÿ”ฎ

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๐Ÿ” Deep Concept: Algebra = Har Case Ka Saboot

Golu 100 numbers pe trick aazma le, phir bhi โ€œhar number pe chalegaโ€ saabit nahi hota. Par x pe ek baar dikha diya to saare numbers ke liye saboot ho gaya, decimal aur negative bhi!

Yahi algebra ki taakat hai: anant cases ek line mein. ๐Ÿ”

sirf charumam.com readers ke liye ๐Ÿ”

โœ๏ธ Solved Examples

Example 1 (Easy): ร— 2, + 8, รท 2, โˆ’ x. Jawab?

2x โ†’ 2x + 8 โ†’ x + 4 โ†’ 4.

WHY sahi hai? Socha 10: 20, 28, 14, 4 โœ…

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Example 2 (Medium): Aisi trick banao jiska jawab 7 ho.

ร— 2, + 14, รท 2, โˆ’ x โ†’ 7.

WHY sahi hai? x + 7 โˆ’ x = 7 โœ…

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Example 3 (NCERT style): ร— 4, + 12, รท 4, โˆ’ x. Jawab aur kyun?

4x + 12 โ†’ x + 3 โ†’ 3.

WHY sahi hai? 12 รท 4 = 3 bachta โœ…

๐Ÿ“Œ charumam.com

Golu ka raaz: โ€œx ko cancel karo, jaadu taiyaar!โ€ ๐ŸŽ‰

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๐Ÿ  Real Life Mein

  • ๐ŸŽฉ Party trick: dost hairaan.
  • ๐Ÿ” Secret code: number ko chhupaana aur wapas laana (Post 2 ka date trick).
  • ๐Ÿงฎ Mental maths ki practice.
  • ๐Ÿง‘โ€๐Ÿซ Teacher bina dekhe jawab bata de!

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๐Ÿงญ Kab Use Karein, Kab Nahi

SituationKya kareinKyun
x cancel ho jaayeโœ… Fixed jawabTrick pakki
x bach jaayeโœ… Number padhne wali trickJawab โˆ’ constant
Kuch numbers pe check karnaโš ๏ธ Saboot nahiAlgebra chahiye
รท 2 ke baad aadha numberโœ… TheekDecimal bhi chalega

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โŒโ†’โœ… Worked Mistake

Sawaal: ร— 2, + 6, รท 2, โˆ’ x. Jawab?

โŒ Galat: โ€œ6, kyunki 6 joda tha.โ€

Galti kya hai? 6 bhi 2 se bhaag hua โŒ

โœ… Sahi: (2x + 6) รท 2 = x + 3 โ†’ 3.

Yaad rakho: Bhaag poore expression pe lagta hai.

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๐Ÿ“ 10 MCQs

Q1. Golu ki trick ka jawab?

(a) 2
(b) 4
(c) x
(d) 0
Solution dekho

Sahi jawab: (a)

  • (a) sahi: Sahi โœ…
  • (b) galat: Nahi.
  • (c) galat: Cancel.
  • (d) galat: Nahi.

Q2. (2x + 4) รท 2 = ?

(a) x + 2
(b) x + 4
(c) 2x + 2
(d) x
Solution dekho

Sahi jawab: (a)

  • (a) sahi: Sahi โœ…
  • (b) galat: 4 ka aadha bhoole.
  • (c) galat: Nahi.
  • (d) galat: Nahi.

Q3. Jawab 3 ke liye kya jodo (ร— 2 wali)?

(a) 6
(b) 3
(c) 4
(d) 1.5
Solution dekho

Sahi jawab: (a)

  • (a) sahi: Sahi โœ…
  • (b) galat: Nahi.
  • (c) galat: Jawab 2.
  • (d) galat: Nahi.

Q4. ร— 3, + 9, รท 3, โˆ’ x?

(a) 3
(b) 9
(c) x + 3
(d) 0
Solution dekho

Sahi jawab: (a)

  • (a) sahi: Sahi โœ…
  • (b) galat: Nahi.
  • (c) galat: x ghatana bhoole.
  • (d) galat: Nahi.

Q5. Trick โ€œhar numberโ€ pe kyun?

(a) x cancel
(b) Sanyog
(c) Bade number
(d) Jaadu
Solution dekho

Sahi jawab: (a)

  • (a) sahi: Sahi โœ…
  • (b) galat: Nahi.
  • (c) galat: Nahi.
  • (d) galat: Nahi.

Q6. ร— 2, + 10, รท 2 ke baad jawab 25. Socha?

(a) 20
(b) 25
(c) 30
(d) 15
Solution dekho

Sahi jawab: (a)

  • (a) sahi: x + 5 = 25 โœ…
  • (b) galat: Nahi.
  • (c) galat: Nahi.
  • (d) galat: Nahi.

Q7. ร— 5, + 20, รท 5, โˆ’ x?

(a) 4
(b) 20
(c) 5
(d) x
Solution dekho

Sahi jawab: (a)

  • (a) sahi: Sahi โœ…
  • (b) galat: Nahi.
  • (c) galat: Nahi.
  • (d) galat: Nahi.

Q8. 10 numbers pe chal gayi trick, saboot?

(a) Nahi, algebra chahiye
(b) Haan
(c) Kabhi nahi
(d) Shayad
Solution dekho

Sahi jawab: (a)

  • (a) sahi: Sahi โœ…
  • (b) galat: Nahi.
  • (c) galat: Nahi.
  • (d) galat: Nahi.

Q9. Negative number socha (โˆ’3) to Golu ki trick?

(a) 2
(b) โˆ’2
(c) โˆ’3
(d) 0
Solution dekho

Sahi jawab: (a)

  • (a) sahi: x koi bhi โœ…
  • (b) galat: Nahi.
  • (c) galat: Nahi.
  • (d) galat: Nahi.

Q10. ร— 2, + 14, รท 2, โˆ’ x?

(a) 7
(b) 14
(c) 2
(d) x
Solution dekho

Sahi jawab: (a)

  • (a) sahi: Sahi โœ…
  • (b) galat: Nahi.
  • (c) galat: Nahi.
  • (d) galat: Nahi.

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โ“ FAQs (Bachchon Ke Asli Sawaal)

1. x kya hai?

Letter-number: koi bhi number jo hum nahi jaante.

2. Decimal socha to?

Bhi chalega; x koi bhi number.

3. Apni trick kaise banaayein?

Guna aur bhaag same number se, beech mein jodo, aakhir mein x ghatao.

4. Jawab negative bana sakte?

Haan, ghatana jodo: ร— 2, โˆ’ 6, รท 2, โˆ’ x โ†’ โˆ’3.

5. Kya bina x ghataaye trick?

Haan, phir jawab se number pata kar sakte.

6. Kitne steps?

Jitne chaaho, bas x cancel ho.

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๐Ÿ‹๏ธ Practice Zone (12 Sawaal)

Q1. Easy ร— 2, + 12, รท 2, โˆ’ x?

Solution dekho

6.

Q2. Easy ร— 3, + 6, รท 3, โˆ’ x?

Solution dekho

2.

Q3. Easy Jawab 10 wali trick?

Solution dekho

ร— 2, + 20, รท 2, โˆ’ x.

Q4. Easy Golu ki trick 50 pe chalao.

Solution dekho

100, 104, 52, 2 โœ…

Q5. Medium ร— 2, + 4, ร— 3, รท 6, โˆ’ x?

Solution dekho

(6x + 12) รท 6 = x + 2 โ†’ 2.

Q6. Medium + 5, ร— 2, โˆ’ 10, รท 2. Jawab?

Solution dekho

2x + 10 โˆ’ 10 = 2x โ†’ รท 2 = x (socha number hi!).

Q7. Medium ร— 2, โˆ’ 6, รท 2, โˆ’ x?

Solution dekho

โˆ’3.

Q8. NCERT style Trick ko 3 pe khatam karo.

Solution dekho

4 ki jagah 6 jodo.

Q9. NCERT style Trick ko 5 pe khatam karo.

Solution dekho

10 jodo.

Q10. Medium Ek lambi trick banao (5 steps) jo 1 de.

Solution dekho

+ 3, ร— 2, โˆ’ 4, รท 2, โˆ’ x โ†’ 1.

Q11. Medium ร— 4, + 8, รท 2, โˆ’ 2x?

Solution dekho

4.

Q12. NCERT style Algebra kyun zaroori?

Solution dekho

Har number ke liye ek saath saboot.

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๐Ÿง  HOTS (Sochne Wale Sawaal)

Q1. Trick: socho, + 1, square, โˆ’ xยฒ, โˆ’ 2x. Jawab?

Solution dekho

(x + 1)ยฒ โˆ’ xยฒ โˆ’ 2x = 1.

Q2. Kya ร— 0 wali trick jaadu hai?

Solution dekho

Haan par bekaar; sab 0 ho jaata, koi bhi samajh lega!

Q3. Dost ka jawab 17 (ร— 2, + 10, รท 2). Socha?

Solution dekho

12.

Q4. ร— 3 aur รท 2 milao, phir bhi x cancel?

Solution dekho

ร— 2, รท 2 ki jagah ร— 3, รท 3 rakho; mismatch se x bachta: 3x/2 โˆ’ x = x/2.

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๐Ÿ† Olympiad Corner

Q1. Socho, ร— 9, + 18, รท 9, โˆ’ x, ร— 100?

Solution dekho

200.

Q2. Socho, uska square, + 2x, + 1, โˆš, โˆ’ x?

Solution dekho

โˆš(x + 1)ยฒ โˆ’ x = 1 (positive x ke liye).

Q3. Do numbers socho, jodo, phir pehla do baar ghatao, doosra jodo?

Solution dekho

(a + b) โˆ’ 2a + b = 2b โˆ’ a. Fixed nahi.

Q4. Kab โ€œsocho, ร— k, + m, รท k, โˆ’ xโ€ ka jawab poora number?

Solution dekho

Jab m, k ka multiple ho.

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๐Ÿ’— CharuMam Motivation

Golu ka jaadu asal mein ek line ka algebra tha! ๐ŸŽฉ

Jo cheez jaadu lagti hai, uske peeche hamesha koi samajh hoti hai. โ€œKaise?โ€ poochhna kabhi mat chhodo, wahi aapko jaadugar se vaigyanik banata hai! โœจ

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๐ŸŸข Master Recap

  • Socha number = x; har kadam x pe.
  • x cancel ho โ†’ fixed jawab.
  • ร— 2, + 2k, รท 2, โˆ’ x โ†’ k.
  • x bache to jawab se number padh sakte ho.
  • Algebra = har number ke liye saboot.

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Agla jaadu: dost ka janamdin bina poochhe bataana! ๐ŸŽ‚

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