using calculator

@zugedanit (1958)
Philippines
February 16, 2007 10:15am CST
How do I do calculations without a calculator? What do I need to know?
1 person likes this
1 response
@abhax123 (1696)
• India
16 Feb 07
Well i try to calculate with the helps of fingers or in my brain but i use to claculate all the things by writting it down no matter how long....