MULTIPLICATION OF NUMBERS CLOSE TO 10

A)MULTIPLICATION OF NUMBERS CLOSE TO 10.

EX: 1 9X8 9 is 1 less than 10& 8 is 2 less than 10. now multiply 1&2
write in this way

9...........1
x8...........2
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7 2 Here 7= 9-2 or 8-1 (cross subtraction)
2=1x2
therefore 9x8=72.

EX:2 12X14 12 is 2 more than 10 &14 is 4 more than 10

12..........2
x 14..........4
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16 8 here 8=2x4 and 16=12+4 or 14+2(cross addition)

there fore 12x14=168