Tool to make multiplication with large numbers (with lots of digits/figures). Standard calculators are limited with big numbers.
Multiplication - dCode
Tag(s) : Arithmetics
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Multiplication
Multiplication of 2 numbers
Multiply many numbers
Calculation with Multiplication
Answers to Questions (FAQ)
How to calculate a multiplication with big numbers?
Multiplication is a basic arithmetic operation defined as the repetition of an addition.
Example: 3 times 2 $ = 3 \times 2 = 2+2+2 $
The dCode multiplication tool with big integers uses arbitrary precision calculation algorithms. That is to say that it is not limited to 4 billion and it can multiply exact values without rounding nor need of a scientific notation. It is called large/huge number multiplication.
What are multiplication tables?
Traditionally multiplication tables refers to this table:
| \ | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 2 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 |
| 3 | 3 | 6 | 9 | 12 | 15 | 18 | 21 | 24 | 27 | 30 |
| 4 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | 32 | 36 | 40 |
| 5 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 |
| 6 | 6 | 12 | 18 | 24 | 30 | 36 | 42 | 48 | 54 | 60 |
| 7 | 7 | 14 | 21 | 28 | 35 | 42 | 49 | 56 | 63 | 70 |
| 8 | 8 | 16 | 24 | 32 | 40 | 48 | 56 | 64 | 72 | 80 |
| 9 | 9 | 18 | 27 | 36 | 45 | 54 | 63 | 72 | 81 | 90 |
| 10 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
What is the Karatsuba algorithm?
In order to improve calculation time the multiplication is accelerated by decomposing it:
ab * cd = (a * 10^k + b) * (c * 10^k + d) = ac * 10^2k + (ad + bc) * 10^k + bd
This multiplication needs 4 values ac, ad, bc and bd. More:
(a * 10^k + b) * (c * 10^k + d) = ac * 10^2k + (ac + bd - (a - b)(c - d)) * 10^k + bd
The same multiplication needs 3 values: ac, bd and (a - b)(c - d).
Source code
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