FrontMultiplying two digit numbers (less than 100 and greater or equal to 80) easier
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- Engr_Joseph
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Engr_Joseph Sat 10 Dec 2016, 9:25 am
Making multiplication easier:
*Multiplying two digit numbers (less than 100 and greater or equal to 80) with each other:
Example:- 95 x 97
Steps:
1) Find the difference of each number from 100:
95 x 97
5 3
2) Cross Subtract the difference
(95-3)=(97-5)=92 => This is the first part of the answer
3) Multiply the differences
5 x 3 = 15 => This is the last part of the answer
THUS, 95 x 97 = 9215
*Multiplying three digit numbers
(greater than 100 and less than or equal to 120) with each other:
Example:- 107 x 104
Steps: 1) Find the difference of each number from 100:
107 x 104
7 4
2) Cross add the difference
(107+4)=(104+7)=111 => This is the first part of the answer
3) Multiply the differences:
7x4=28 => This is the last part of the answer
THUS,
107x104= 11128
*Multiplying two digit numbers (less than 100 and greater or equal to 80) with each other:
Example:- 95 x 97
Steps:
1) Find the difference of each number from 100:
95 x 97
5 3
2) Cross Subtract the difference
(95-3)=(97-5)=92 => This is the first part of the answer
3) Multiply the differences
5 x 3 = 15 => This is the last part of the answer
THUS, 95 x 97 = 9215
*Multiplying three digit numbers
(greater than 100 and less than or equal to 120) with each other:
Example:- 107 x 104
Steps: 1) Find the difference of each number from 100:
107 x 104
7 4
2) Cross add the difference
(107+4)=(104+7)=111 => This is the first part of the answer
3) Multiply the differences:
7x4=28 => This is the last part of the answer
THUS,
107x104= 11128
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