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Ek Lakh Kismein!

Class 7 Maths · Chapter 1: Hamare Aas-paas Bade Numbers · NCERT Ganita Prakash section 1.1

Seekho

Meher ke dadaji gaon mein ek seed bank rakhte hain: millets aur daalon ki kai kismon ke beejon ki chhoti kapde ki thailiyan. "Bahut pehle," wo kehte hain, "hamare desh ke kisaan lakhon alag kismein ugaate the." Meher sochti hai: ek lakh aakhir kitna bada hai?

Pattern dekho. Sabse bada 3-ank ka number 999 hai; 1 jodo to sabse chhota 4-ank ka number 1,000 milta hai. Sabse bada 4-ank ka number 9,999; 1 jodo → 10,000. Sabse bada 5-ank ka number 99,999; 1 jodo → 1,00,000, sabse chhota 6-ank ka number. Ise ek lakh padhte hain.

99,999 + 1 = 1,00,000 (one lakh)

Lakh bada hai ya chhota? Ye is par nirbhar hai ki tum kis se tulna karte ho. Ek lakh din lagbhag 274 saal hain, kisi bhi insaan ki umar se lambe (365 × 274 = 1,00,010). Par ek bade cricket stadium mein lakh se zyaada log baith sakte hain, aur insaan ke sir par chhoti si jagah mein lagbhag ek lakh baal hote hain!

365 × 274 = 1,00,010 days ≈ 1 lakh

Padhna aur likhna: Indian system mein thousands ke group ke baad comma, phir har do ank ke baad: 12,78,830 ko padhte hain barah lakh athattar hazaar aath sau tees (twelve lakh seventy eight thousand eight hundred thirty). Ulta, "fifty lakh five thousand fifty" = 50,05,050: khaali sthaanon par zero aata hai.

50,05,050 = 50 lakh + 5 thousand + 50

Explore: ank-pahiyon par numbers banao.

  1. Ek lakh banao.
  2. Sabse bada 5-ank ka number banao (pehla pahiya 0 par rakh sakte ho).
  3. Fifty lakh five thousand fifty banao.
  4. Ten lakh two hundred thirty five banao.

Yaad rakho

  • 1,00,000 (ek lakh) sabse chhota 6-ank ka number hai: 99,999 + 1.
  • Indian commas: thousands ke group ke baad, phir har do ank (12,78,830).

Quick check

Sabse chhota 6-ank ka number kaunsa hai?

  1. 1,00,000
  2. 99,999
  3. 10,000
  4. 1,00,001
Answer

1,00,000. 99,999 + 1 = 1,00,000, ek lakh.

Socho

Kya ek lakh rupaye bahut paisa hai? Ek kaaran do ki haan, aur ek ki nahi.

Ek answer

Cycle kharidne ke liye bahut hai (darjanon aa jaayengi!), par shahar mein ghar kharidne ke liye kam, jo kai lakh ka hota hai. Number bada hai ya nahi, ye tulna par nirbhar hai.

Practice

Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.