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Lesson15 |
Division by Number Ending 3 & 7 or Any Other number
I think all of you people
have become well conversant in
division of 19 as we learned
it in previous lesson .Now with the help of division of 19 we learn
division by 13 and 17
Division by ...3
Let see one example
456 =????
13
Multiply nume./ demo. each by 3
456 x3 = 1368 = 1368 =136.8
13x3 39
40 4
3 41 0 7 6 =
35076
13 6 8
/4
1 9 3
12
42 2
10
30 27
Our required answer is 35.076
Let see one more example 893 = 893x3 =2679
= 2679 = 267.9
23
23x3 69
70 7
3 8 8 2
6
267 9
/7
5
10
60 4
17
57 18 42
Our required answer is 38.826
Division by ...7 Learn with the help of example
268 = ???? Multiply nume. /demo. each by7
27
268 x7 = 1876
= 1876
27x7
189 19
9 9 2 59 2
1876
/19
16 15 _ 175 ,49 ,112 ,175,49 Now
we write whole rough
work in single line for fast speed
9.92892 is our required answer
Division by Any number
268 =?? 268 x3
= 804 = 804
43
43 x3 129
13
6232
804
/13
210 _30,42,33
Answer =6.232
One more example
398 = 398x3 = 1194
= 1194
23 23x3
69 7
17304
1194
/7
410_50 ,111_21,30
Answer =17.304
Division by this method is not always feasible .Some time it creates problem
also
298 8 = 2988x9 =
26892 = 26892
221
221x9 1989
199
Division by 211or division by 199 has any difference , even division by199
takes your more time .So use this method carefully . It gives wonderful
results with presence of mind
