If you are thinking about numbers that look like this +5 then you are thinking of positive numbers. A positive number is any number above 0. Writing +5 is exactly like writing 5 as they are the same number.
The opposite to a positive number is a negative number. A negative number is any number below 0. Negative five is written like this -5.
I hope that helps
Any number adds to 15.
-70
Assuming that "adds up to" means "its digits add up to" 888
727 ywwH
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199 and 11
8.81 and -6.81
14
Add your answer with the lower number of the subtraction problem and if it adds up to the upper number then you are right.
Any number can multiply 144 and be added to 7!
43
The numbers are: -2 and -20