📘 MATHS⚡ Speed MathsLevel 2 · Multiplication MagicChapter 114 Posts
Multiply by 12 (Trachtenberg) ✖️
12 se guna bina pahaade: number ke aage ek 0 lagao, phir right se left har digit ka double karo aur uska padosi (right wala digit) jodo (47 × 12 = 564). Yeh niyam Trachtenberg naam ke ganitagya (maths expert) ka hai. Chitra se samjhenge yeh kyun chalta hai (12 = 10 + 2), lambe number mein carry 1 ya 2, Chapter 4 ke × 11 se farak, aur ulte sawaal (□ × 12 = 696). Har post mein timer, diagram, drill, MCQs aur Challenge.
🌱 Naye ho? Pehle Ch 1 se Ch 10 tak kram se padho, phir yahan 11.1 se shuru karo. (Ch 9 abhi nahi aaya hai; use chhod kar padho.)
11.1
Multiply by 12: Double Karo, Padosi Jodo (47 × 12)
Aage 0, right se left: double + padosi. 23 × 12 = 276, 47 × 12 = 564
Padho →
11.2
Lamba Number × 12: Carry 1 Ya 2 (3142 × 12)
3-digit, 4-digit × 12, carry 2 tak: 3142 × 12 = 37704, 899 × 12 = 10788
Padho →
11.3
× 11 Aur × 12 Ka Mix: Kaunsa Niyam, Aur Check
× 11 = digit + padosi, × 12 = double + padosi, aur jawab check karna
Padho →
11.4
Multiply by 12 Ke Tricky Sawaal
Soch wale mushkil sawaal — 11.1–11.3 ka mix, darjan, ulte sawaal aur dhokhe
Padho →
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