In an addition sum, if the missing number is the first number, for example, x + 5 = 10, then to find x, perform the sum 10 - 5, producing the solution x = 5.
In a subtraction sum, if the missing number is the second number, for example, 7 - y = 4, then to find y, perform the sum 7 - 4 = 3, production the solution y = 3.
3.5 and -1.5
The numbers are 7 and 6
10 and 15.
12. Its given in the question
Difference. A sum is the result of adding two numbers, and a difference is the result of subtracting two numbers.
The average of a set of numbers is defined as the sum of those numbers divided by the number of numbers. If the average is given, multiply that by number of items in the set including the missing number. Subtract the sum of given numbers from this quotient and the missing number is revealed.
12
4 and 12
12 and 24!
8 & 12
0.4 and 2.
3.5 and -1.5
The numbers are 7 and 6
The sum of a fraction? Well, to find the sum of the fraction all you do is divide both top and bottom numbers.
4
- 1 and 5.
10 and 15.