Please enable JavaScript.
Coggle requires JavaScript to display documents.
simplifications - Coggle Diagram
simplifications
additions
3 digit
4 digit
2 digits
5, 2 digit numbers ex:66+59+87+34+25
add all tens place digits
6+5+8+3+2= 24
this will be our final ans
271
now this this sum add all ones place digit EXCEPT THE ONE WE BOUGHT DOWM
245+ 4,7,9,6(remaining all ones place digit)
271
now to this sum, bring the last ones place digit beside this sum
245
last ones place digit down ie 5 down
multiplication
1digit * 2 digit
first consider 9*2 = 18
now consider 9*7=63
consider an example 9*27
combine both the ans( note: here we are combining both the ans not adding them)
1863
for 1di*2di multi ans is always 3 digit
so now, we need to convert this 1863 4digi num into 3 digi num
but how, add first 2 digit with 3rd digit 18+6= 24
this 24 will be our 1st 2 digits
and last digit willbe our unit digit 3
so and will be 243
2digit* 2digit
91*46
step1: 91*4
364
step2: now mul this 9 with 6 = 54
step3: now add both above values 364+54= 418
this will be our 1st three digits
step4: now mul 1* 6= 6
this will bw our last digit
ans: 4186
for 2di*2di mul ans is always 4 digit
subtraction