Need urgent help! How do you calculate numbers without using a calculator?

Personally I like to add each part of the number individually. For example what you said 987 + 564. I start with the smallest number and work my way up.

987 + 564 7 + 4 = 11 8 + 6 = 14 80 + 60 = 140 9 + 5 = 14 900 + 500 = 1,400 11 + 140 = 151 151 + 1,400 = 1,551.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.