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Theek aur Lagbhag Maan

Class 7 Maths · Chapter 1: Hamare Aas-paas Bade Numbers · NCERT Ganita Prakash section 1.4

Seekho

Akhbaar likhta hai "book fair mein 1 lakh log aaye." Kya theek 1,00,000 aaye? Shaayad nahi! Aksar lagbhag number kaafi hota hai. Agar kisi shahar mein 76,068 log hain, to "lagbhag 76,000" (ya "lagbhag 75,000") kehna uske aakaar ka achha andaaza deta hai.

Upar ya neeche round? Upar round karo jab kam padna mushkil ho: school function ke 732 logon ke liye 750 mithaiyan mangao. Mota andaaza dena ho to neeche: ₹470 ki cheez "lagbhag ₹450". Aur kuch cheezein theek honi chahiye: bank ke paise, phone number, davaai ki khuraak.

Sabse paas ke padosi: 6,72,85,183 ka sabse paas ka thousand 6,72,85,000, ten thousand 6,72,90,000, lakh 6,73,00,000, ten lakh 6,70,00,000 aur crore 7,00,00,000. Niyam: us sthaan ke theek daayein wala ank dekho: 5 ya zyaada → upar, 5 se kam → neeche.

6,72,85,183 ≈ 6,73,00,000 (nearest lakh)

Jod ka andaaza: kya 4,63,128 + 4,19,682, 8,50,000 se zyaada hai ya kam? Round karo: lagbhag 4,60,000 + 4,20,000 = 8,80,000, to zyaada. Theek jawab 8,82,810 hai. Pehle andaaza lagaana galtiyan pakadne mein madad karta hai: agar 98,28,10 aaya, to pata chal jaata ki kuch gadbad hai!

4,63,128 + 4,19,682 = 8,82,810 ≈ 8,80,000

Explore: number line par round karo.

  1. Marker ko 4,63,128 ke sabse paas ke ten thousand par rakho.
  2. Marker ko 4,87,500 ke sabse paas ke ten thousand par rakho.
  3. Marker ko 4,19,682 ke sabse paas ke lakh par rakho.

Yaad rakho

  • Lagbhag maan aksar kaafi hote hain; kuch cheezein (paise, phone number, davaai) theek honi chahiye.
  • Round karne ke liye agla daayan ank dekho: 5 ya zyaada → upar, 5 se kam → neeche.

Quick check

3,87,69,957 ko sabse paas ke lakh tak round karo.

  1. 3,88,00,000
  2. 3,87,00,000
  3. 3,90,00,000
  4. 4,00,00,000
Answer

3,88,00,000. Lakh ke baad wala ank 6 hai (5 ya zyaada), to upar.

Socho

Ek number ke sabse paas ke thousand, ten thousand, lakh, ten lakh aur crore, sab 5,00,00,000 hain. Ek aisa number batao.

Ek answer

4,99,99,500 se 5,00,00,499 tak koi bhi, jaise 5,00,00,123. Har sthaan par 5,00,00,000 hi aana chahiye, nearest thousand par bhi, isliye 5 crore se 500 ke andar.

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.