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Mental Math

Class 6 Maths · Chapter 3: Number Play · NCERT Ganita Prakash section 3.8

Seekho

Gol numbers se bade jod dimaag mein aasaan hain. Boxes ke numbers jitni baar chaho use karke: 5,300 = 2,500 + 2,500 + 300.

5,300 = 2,500 + 2,500 + 300

Ek aur: 31,600 = 20,000 + 11,000 + 300 + 300.

20,000 + 11,000 + 600 = 31,600

Hum ghata bhi sakte hain: 49,500 = 50,000 − 900 + 400.

50,000 − 900 + 400 = 49,500

Hamesha, kabhi-kabhi ya kabhi nahi? 3-digit + 3-digit se 3 digits (120 + 340 = 460) ya 4 digits (700 + 800 = 1,500) mil sakte hain. To '3-digit + 3-digit se 3-digit number milta hai' kabhi-kabhi sach hai.

Explore: number cards se dimaag mein bade numbers banao. Ek card dobara use ho sakta hai.

  1. 5,300 banao.
  2. 31,600 banao.
  3. 49,500 banao. Ghata bhi sakte ho.

Yaad rakho

  • Dimaag mein jodne-ghataane ke liye bade numbers ko gol hisson mein todo.
  • 'Hamesha, kabhi-kabhi, kabhi nahi' ko har tarah ke sabse chhote aur bade numbers se jaancho.

Quick check

40,000 − 800 + 300 = ?

  1. 39,500
  2. 39,800
  3. 41,100
  4. 39,200
Answer

39,500. 40,000 − 800 = 39,200, phir + 300 = 39,500.

Socho

Kya sirf 2,500, 300 aur 20,000 jodkar theek 1,000 bana sakte ho?

Ek answer

Nahi. 2,500 aur 20,000 pehle se 1,000 se bade hain, aur 300 se 300, 600, 900, phir 1,200 bante hain: 1,000 chhoot jaata 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.