7 is the actual answer but did you know the tecnical answer is 13 when you add 1 when you subtract and when you add it is 42.
30
13%% of 339 = 0.0013*339 = 0.4407 To subtract 13 %% from 339 = 339 - 0.4407 = 338.5593
-55
42
-42
7 is the actual answer but did you know the tecnical answer is 13 when you add 1 when you subtract and when you add it is 42.
48.
7 times 6 is 42. If you subtract two, you get 42-2= 40.
30
32
-13 is the number must you subtract from -13 to get a difference of 0
The only common factor of 13 and 42 is 1, since 13 is prime and 42 is not a multiple of 13.
I assume you mean "divisibility rule". Separate the last three digits, and subtract it from the remaining digits. For example: 45003: separate 45 and 003, and subtract 45 - 3 = 42. Since 42 is a multiple of 7, the original number is a multiple of seven. Note that this rule works for 7, 11, and 13. The reason it works is related to the fact that 1001 = 7 x 11 x 13.
13 + 42 = 55
13%% of 339 = 0.0013*339 = 0.4407 To subtract 13 %% from 339 = 339 - 0.4407 = 338.5593
-55