Why Flip and Multiply Works | Class 7 Maths Ch 8 | NCERT Ganita Prakash

In this lesson: • Keep, change, flip: but why does it work? • 2 ÷ one third = 6, the same as times 3 • 2 ÷ two thirds: times 3, then ÷ 2, which is times 3/2 • Examples: 3/4 ÷ 1/2 = 3/2 and 3/4 ÷ 3/8 = 2 • Check by multiplying back; a fraction times its flip is 1 • The reciprocal, and Brahmagupta's rule from 628 • Trap: flip only the divisor NCERT Ganita Prakash, Class 7 — Chapter 8: Working with Fractions