Potential answers for "Old math calculating tool"

⭐⭐⭐⭐ SLIDERULE
⭐⭐⭐ ABACUS
⭐⭐⭐ SLIDE
⭐⭐ CPA
⭐⭐ ENIAC
⭐⭐ PASCAL
⭐⭐ MATH

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