Before having mobile I remembered many of the landline contact numbers but after getting mobile I do not remember as many numbers. The same things would be implemented if we talk about photographs as now we all have a camera on mobile so we did not have many paper photos.
I did not use mobile for basic calculation because I feel it takes too long to take mobile then enter pattern then got to the calculator and finally type digits if you made a mistake whole calculation would be wrong, so here I preferred counted them mentally, I feel more confident when I do it but you are also right at your place that many of people having same practice buy using calculator for basic maths.
Keep your Face to the SunShine
Lead the leader
" The two most important days in your life are the day when you are born and the day you find out why? "
– Mark Twain
Last Sunday, I went to a vegetable shop and bought some vegetables. The lady there took out a print and gave it to me. I doubted the figures and asked her to check the items. The items were worth only Rs. 251, but her bill showed 340. The bill showed two additional items that I did not buy. Then she said, "Sorry Sir, two items from the previous bill for Rs. 89/- got added with your bill by mistake." Since then, I am very careful to check the bill for its correctness..
No life without Sun
Thoughts exchanged is knowledge gained.