tell me trick of multiplying big digits?

Question

also tell me the source

Answer 1

Use a big calculator.

Hope this helps.

Answer 2

Use also big handwriting!

^_^

joke!

Some special multiplications are easy, such as multiplying by 5,25,125 or 11, or 121.

To multiply by 5, divide the number by 2 and multiply 10.

e.g.
55152 x 5 = 55152/2 x 10 = 27576 x 10 = 275760

To multiply by 25 or 125, divide the number by 4 or 8 and multiply 100 or 1000, respectively.

e.g.
2442 x 25 = 2442/4 x 100 = 610.5 x 100 = 61050

32378 x 125 = 32378/8 x 1000 = 4092.25 x 1000 = 4092250

^_^

Answer 3

I know that my ans will be selected as the best ans.

My ans

now take two numbers such as 598*632

now multiply one of the terms with 2 & divide the other by 2

here 632/2 * 598*2
amd you get 316*1196
Now again do the same ie 158*2392
Now again do the same ie 79*4784
Since it cannot be simplified further you better multiply And it leaves with the ans 377936

Answer 4

if it is 321X543 u firdt multiply 3 times 1, 3 times 2 , 3 times 3.
Then do same thing for next #, except that u have to put a 0 first then do what I did above. U will get answer once u mulitply. Oh, ya once u r on 5, put two zeros first.
(174, 303 answ.)

Answer 5

No trick at all. Say you have a pair of 3 digit numbers (say abc and xyz) There will be 9 'partial products' (namely ax, ay, az, bx, by, bz, cx, cy, and cz) which you then add up to form the final answer.

Other than that, it's just practice ☺


Doug

Answer 6

Calculator.

Answer 7

Just do it. sorry to sound like a nike ad but its the truth,

Answer 8

http://mathforum.org/k12/mathtips/multiplication.tips.html

Answer 9

138,509,825
x 3,843,834
**************

try to multiply it by doing this
138,509,825
x 3,000,000
**************
answer 1

then this
138,509,825
x 800,000
*************
answer 2


then;
138,509,825
x 40,000
*************
answer 3


then:
138,509,825
x 3,000
*************
answer 4

then:
138,509,825
x 800
*************
answer 5


then:
138,509,825
x 30
*************
answer 6

then:
138,509,825
x 4
*************
answer 7




then add answe 1 to 7 then you'll get the answer ^_~
source: my mind

Answer 10

i just use my brain and than i figure it out