20+16 = 36
20 - 16 = 4
well that is easy to add two whole numbers like 8+10 is just 18 so you find the total of the two numbers. then to subtract you take it away so 9-4=5 then to check add the 2nd number (in this case 4) to what the sum equals and 4+5=9
Its indefinite: Start with 0,1 add last two numbers = 1 add to sequence = 0,1,1 add last two numbers = 2 add to sequence = 0,1,1,2 add last two numbers = 3 add to sequence = 0,1,1,2,3 add last two numbers = 5 add to sequence = 0,1,1,2,3,5 add last two numbers ......... add to sequence ..........
That is not possible
Take the average of the two numbers. In other words, add them, and divide the result by 2. 70
You take the average of the two middle numbers. Simple example is when you have 4 numbers. Take the two middle ones, add them and divide by 2. That number is the median.
lol
Usually you would take the mean of the two numbers. (Add them together and then divide by 2).
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Well, technically, addition and subtraction are opposites. if you add two numbers together, then you take one and put the other with it. if you subtract two numbers, you take one away from the other. if you are adding or subtracting decimals, then make sure that the decimals are lined up. Fractions have some different rules.