The Abacus
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The Abacus
They used 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.
Youy can use a TI 84.
If you don't know what the answer is to a hard maths question people use calculators. Like 644 times 1076? Who would know that!?