Multiplication Tricks
Multiply any 2 digit by 2 digit
By using three simple steps we can find multiply of 2 digit numbers.
STEP 1: Multiply 1's digit together.
STEP 2: Cross Multiply and add them.
STEP 3: Multiply 10's digit together.
Note that to carry whenever a product exceeds 9.Only the leftmost part can have more than one digit. For the rest of the parts, we need to carry over the number preceding the units digit, to the immediate left part , and add it there respectively.
Lets see some examples:
Example 1: Find out 12 X 22.
STEP 1: Multiply 1's digit together i.e(2 X 2)=4 [1's digit answer.]
STEP 2: Cross Multiply and add them. i.e (1 X 2) + (2 X 2)=6 [10's digit answer.]
STEP 3: Multiply 10's digit together i.e(1 X 2)=2 [100's digit answer.]
STEP 4: Combine them 264 is the answer.
Example 2: Find out 31 X 42.
STEP 1: Multiply 1's digit together i.e(1 X 2)=2 [1's digit answer.]
STEP 2: Cross Multiply and add them. i.e (3 X 2) + (1 X 4)=10 [put the 0 as the 10's digit answer and carry 1 ]
STEP 3: Multiply 10's digit together and add with carry that is 1 i.e(3 X 4) + 1= 13[100's digit answer.]
STEP 4: Combine them 1302 is the answer.
Example 3: Find out 59 X 42.
STEP 1: Multiply 1's digit together i.e(9 X 2)= 18 [8 is at 1's digit answer and carry 1]
STEP 2: Cross Multiply and add them with carry. i.e (5 X 2) + (9 X 4) + 1=47 [put the 7 as the 10's digit answer and carry 4 ]
STEP 3: Multiply 10's digit together and add with carry that is 4 i.e(5 X 4) + 4= 24[100's digit answer.]
STEP 4: Combine them 2478 is the answer.