📘 MATHS⚡ Speed MathsLevel 2 · Multiplication MagicChapter 124 Posts
Trachtenberg Rules for 6, 7, 8, 9 🧮
Pahaade ke bina 6, 7, 8 aur 9 se guna! × 6: digit + padosi ka aadha, taaq digit pe 5 aur. × 7: wahi, par digit ka double. × 9: ikai 10 se, baaki 9 se ghatao, padosi jodo, aakhir mein 1 kam. × 8: × 9 jaisa, par double aur aakhir mein 2 kam. Har niyam kyun chalta hai (6 = 1 + 5, 7 = 2 + 5, × 9 = × 10 − number), chitra ke saath, aur ulte sawaal (□ × 7 = 238). Har post mein timer, diagram, drill, MCQs aur Challenge.
🌱 Naye ho? Pehle Ch 1 se Ch 11 tak kram se padho, phir yahan 12.1 se shuru karo. (Ch 9 abhi nahi aaya hai; use chhod kar padho.)
12.1
Multiply by 6: Aadha Padosi Aur Taaq Pe 5 (Trachtenberg)
Digit + padosi ka aadha, taaq digit pe +5: 24 × 6 = 144, 357 × 6 = 2142
Padho →
12.2
Multiply by 7: Double, Aadha Padosi Aur 5 (Trachtenberg)
Double + padosi ka aadha, taaq pe +5: 34 × 7 = 238, 625 × 7 = 4375
Padho →
12.3
Multiply by 8 Aur 9: 10 Se, 9 Se Ghatao (Trachtenberg)
× 9: baaki + padosi, aakhir mein 1 kam; × 8: baaki ka double, aakhir mein 2 kam
Padho →
12.4
Trachtenberg 6, 7, 8, 9 Ke Tricky Sawaal
Soch wale mushkil sawaal: 12.1–12.3 ka mix, kaunsa niyam, ulte sawaal aur dhokhe
Padho →
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