LEVEL-2 | SESSION 8| Squaring Numbers | Duplex Method

What is the duplex of a single digit number 4?

• 4

• 8

• 16

• 2

What is the duplex of two digits 2 and 3?

• 12

• 6

• 5

• 1

Duplex of 2, 3, 4 is:

• 2×2 + 3×4

• 2 x (2×4) + 3²

• 2×3 + 4

• 4×2 + 3

Duplex method is primarily used for:

• Division

• Multiplication of decimals

• Finding squares

• Solving equations

46² using duplex method equals:

• 2226

• 2216

• 2116

• 2211

437² using duplex method equals:

• 190929

• 199969

• 190969

• 120969

• D(4) = 4² = 16

• D(1) = 1

• D(1,0) = 0

• D(4,0)

479² using duplex method equals:

• 229741

• 239441

• 229441

• 329441

6325² using duplex method equals:

• 49995625

• 44005625

• 40005625

• 40225625

5687² using duplex method equals:

• 32341969

• 32343969

• 32348969

• 42341969