Math Tricks

Assalam o alikum
Aj me apko kuch Math ke behtreen tips btati hn jis se ap calculation bina caculator k karlengen
Gar ap 2 number ko zarab karna chahte hen
jese k:
45*7
to ap 45 ko toren 40+5 me
phr 40 ko zarab den 7 se 40*7= 280
phr 7 ko zarab den 5 se 5*7=35
ab dono product ko plus karden 280+35=315
agar ap 9 ko zarab karna chahte hen kise b ese nu se jo 11 se chota ho or apko table yad na ho to mere aps eska asan hal he
9*8:
ap apna hath zameen per rakhen or apni 8th finger ko chupa len
or phr ulte hath se ginna start karen or 8th finger tak ake rul jayen apko 7 milega
phr sedhe hath se gin na shuru karen or 8th se pehle ruk jaye ap ko 2 ans milega
or 9 ko agar 8 se zarab den to 72 ans ata he
agar ap kisi nu ko 4 se zarab karna chahte hen to usko double karen or phr double kare
jese 75*4
double of 75=150
double of 150=300

agar ap kisi num ko 5 se zarab karna chahte hen to pehle use adha kare phr use 10 se zarab karen
jese k
50*5
50 ka adha he 25
25*10=250