Because some math problems are to hard to figure out.
The Abacus
They used the abacus
Yes
The disadvantages of calculators is that they are no longer practical or convenient. Unless scientific in nature, most people use the calculators on their smart phones and wireless devices. While stand alone calculators are still in use, their popularity has immensely decreased across the nation.
no there are no solar calculators in india
Most people use online calculators.
Among other financial calculators, Bank Rate has a car finance calculator which many people find very helpful: http://www.bankrate.com/calculators/auto/car-finance-payment-calculator.aspx
Fitness calculators
The best investment calculators, and general finance calculators, are all found online at BankRate.com. This is the best website for calculators, in my personal opinion.
People in Egyptian times used bones as a calculating method.
Love calculators are novice online calculators to determine how much two people love each other. The percentage is worked out by using a simple math method.
simple calculators