Question

tricks to multiply 2 digit number ending on 5

Answer 1

take number x multiply with it 2 and then 5 and then by 10 next divide it with and then divided by 2 you geto a number end with 0 or 5 if theyou get 0 ask theme to add 5

Answer 2

There is a easy and quick way to find out the product of two numbers ending with 5.

Let us take an example

45 X 85


Step 1 : 4 + 8 = 12 ( Sum of the digits of two numbers leaving the last digit)
Since 12 is an even number write 25 in the answer.
Step 2 : 4 X 8 = 32
Step 3 : (4+8)/2 = 6 ( Since the sum is the even number we divide it by 2)
Step 4 : 32+6= 38
Write it together 3825.
Let us take another example
35 X 85
Step 1 : 3 + 8 = 11
Since the sum of first two digits are odd write 75 in the answer.
Step 2 : 3 X 8 = 24
Step 3 : (3+8-1) / 2 = 5 ( Since the sum is the odd number, we deduct -1)
Step 4 : 24 + 5 =29
Write it together 2975
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.
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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