Today was Catherine´s birthday. She turned 24. Catherine is twice as old as Ryan was when Catherine was as old as Ryan now. How old is Ryan now?..................
Multiply any two numbers in few seconds
Ex:
12 X 14
Step :1
Let us split units and tenth digit separately,
1 2
1 4
Step :2
Multiply tenth digits which is 1 X 1 = 1 and keep it left side of the solution
Step :3
Multiply Units which is 2 X 4 = 8 and keep it right side of the solution
Step :4
Now cross multiply the units and tenth digit
1 X 2 = 2
1 X 4 = 4
Step :5
Sum the result of the cross multiplication
2 + 4 = 6
Step :6
Insert this result in the middle of Left and Right
Left = 1
Middle= 6
Right = 8
168
12 X 14 = 168
Ex: 2
Let us see another example
49 X 48
Step : 1
4 9
4 8
Step : 2
4 X 4 = 16
Step : 3
9 X 8 = 72
This is 2 digit number compared to the first example, hence we need to handle little differently
Retain 2 as last digit and bring 7 to the next row
Which the result will look like this
16 2
7
Step : 4
4 X 8 = 32
4 X 9 = 36
Step : 5
32 + 36 = 68
Now here also the result is a 2 digit number hence you have to retain unit digit of the result to bring it to tenth digit of the solution
Take 6 to the next row and place it before 7
1682
67
Step : 6
Now derive the result by normal addition of first row and second row which is
