398
20,18
-386
Divide the number by 100 and then multiply the answer by 5. add the number with the answer.
1
Add the digits together. The sum of the digits of 23 is 5.
You can add them.
the result is always even
656
Zero!
-386
Divide the number by 100 and then multiply the answer by 5. add the number with the answer.
-337
if you add the digits of the number such as 81 8+1=9 every time, the digits of the number will add up to 9
1
Add the digits together. The sum of the digits of 23 is 5.
You can add them.
There are no whole factors of 360 that add to -48, however: (-24 - 6√6) & (-24 + 6√6) ≈ -38.697 & -9.303 will add to -48 and multiply to 360.
The easiest way is to multiply the original number by 1.08. Otherwise, multiply the original number by .08 and add the resulting number to the original number.