31
3
88
154
By the signs: 2+2(Add) 2-2(Subtract) +=add -=subtract
18
3
-76
88
154
By the signs: 2+2(Add) 2-2(Subtract) +=add -=subtract
When you subtract one number from another you get the difference.You just said it; sum.
The numbers are: 76 and 20
9 and 6 but subtract not add
28
18
I believe there are 360 degrees in a quadrilateral. Depending on if the angles are even or not divide by four. But if they give you three angles add those and subtract that from 360. If they give you 2 angles and the other angles appear to be even. Add the two numbers that you have subtract that from 360 then divide by two...
Multiply two odd numbers Add an even and an odd Subtract an odd and an even