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Multiplication Of Two Digit Numbers Ending In 5.

Ajinkya Anant Jawalkar
14/06/2017 0 0

Case 1.) Multiplication of two digit numbers ending in five and tens place having the same number.

  • 25x25 = 625

Modus Operandi:

Multiply the units digits i.e, :5x5 = 25

Now for the tens digit. Multiply 2 with its immediate next number i.e.:3 So you get 2x3=6

Hence the answer = 625.

Case 2:) Multiplication of two digit numbers ending with 5 and units digits are different but their sum is 10.

  • 65x45 = 2925

Modus Operandi:

5x5 = 25 as above,

Now to multiply the tens digits. 6+4=10 (necessary condition: sum should always be 10)

  • 6x4 = 24
  • 24+5 = 29

Hence the answer = 2925

  • 85x25 = 2125
  • 15x95 = 1425
  • 35x75 = 2625
  • 45x65 = 2925
  • 55x55 = 3035


 

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