They used the abacus
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The Abacus
The Abacus
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.
abicuss
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.