Reddit reviews Yellow Mountain Imports Digit Standard Abacus - 10.5 Inches - Professional 17 Column Soroban Calculator (Functional and Educational Learning Tool)
We found 2 Reddit comments about Yellow Mountain Imports Digit Standard Abacus - 10.5 Inches - Professional 17 Column Soroban Calculator (Functional and Educational Learning Tool). Here are the top ones, ranked by their Reddit score.
Timeless Professional Reliability: The soroban is an abacus from Japan that is inspired by ancient Chinese suanpan (abacus); It features counting system used before modern numerals that is still practiced by some merchants, traders, and clerksAn Ideal Educational Tool: Make math practice more effective; Using an abacus for kids' math is a great way to teach them how to count, equate and compute mentallyFeatures Modern Conveniences: This 17-digit professional soroban abacus is made from quality ABS plastic and measures 10.5 x 2.5 x 0.75 inches (26.5 x 6 x 1.5 centimeters)
I use this calculator for calculating cost. https://www.amazon.com/dp/B00SQVXSMM/ref=cm_sw_r_cp_apa_71oJybFX0TZVT
According to this site a digital calculator costs $200 in 1970, so $1,300 today .An Abacus would probably be much cheaper. You can get one today for $8, and I doubt it was any more back then.