If you're not good at mental addition, check into this problem set and become a master before you "discharge"! Each page includes an inspiring slogan! Current exams only feature problems with aligned digits, so working through this problem set will help you concentrate. This is the best material for those who: * Lose track of what they're calculating. * Often skip or omit numbers. * Enter the same number twice. * Subtract in the tens place but add in the ones place (or vice versa). * Always make mistakes when adding (or subtracting) certain numbers. * Often misread numbers (e.g., confusing 69 and 96, or 704 and 740). Many people struggle with borrowing from 100, 500, 1,000, 5,000, or 10,000. I recommend copying the problems without writing on them, and practicing repeatedly until you completely memorize them. B5 size (with answer key) Abacus materials are not subject to price reductions. If you purchase multiple items and save on shipping, the price will be reduced accordingly, so please comment. Multiple purchases are welcome! You might save on shipping. \#soronyan abacus materials ← You can see all the abacus materials here. Shipping is planned via anonymous "Nekopos" delivery. Please read the profile carefully! Carefully! Carefully! Then, if you have no questions or want to combine purchases, please buy without commenting. Abacus Textbook Weakness Overcome Intensive training Mental addition Mental addition Elderly Brain training Right brain Right brain activation Right brain activation Dementia prevention