Mental Abacus Book 3 vs Satellite Chasers

Mental Abacus Book 3 is a bible on rapid calculations. It covers all kinds of vedic mathematics tricks for fast calculations. Book 1 introduces rapid calculations on addition and subtraction, while Book 3 mainly focuses on magic ways in solving multiplications. Abacus serves as an incredible tool in making everything easy and fast. Most important of all, all these methods help to activate and keep our brains shape. Further to Book 2, specific abacus pitfalls are included at the same time. As in the abacus series, Mental Abacus Book 3 is divided into two sections, namely Tutorial and Abaculator. ABACUS TUTORIAL Interfaces are organized in a simple and easy way as in the previous books. Rapid calculation techniques are explained not only in words, but also with sample questions. Numerous examples with demonstration will definitely further strengthen the study effectiveness. For Chapter 7 onwards, prerequisite knowledge of Book 2 is required. ABACULATOR A great tool that demonstrates the steps for BOTH hands abacus mental arithmetic. Just enter any multiplication equation, Abaculator will determine which rapid calculation method should be used, and show you every step with detailed description and explanation. You can pause and continue whenever you need, or even switch to show set of steps for other number or equation in the middle of the demonstration. And More...VIRTUAL ABACUS Built-in virtual abacus enables you to follow the lessons and practice the Two Hands Fingering Method on the abacus at the same time. You can try to solve the examples on the virtual abacus by yourself and check with the demonstration steps provided on the page as well. FEATURES SUMMARY: - All kinds of Rapid Calculations on Multiplication - Multiplicative Pithy Formula Tricks - Abacus Decimal Division - Rounding to the nearest hundredth Pitfall - Dealing with Negative Numbers on Abacus - Abaculator auto-determines the best rapid calculation method - Two hands fingering method fosters right brain functions - Virtual Abacus allows you to practise along everywhere - Assists in achieving the ultimate aim of abacus training, transforming visualized beads move on imaginary abacus and getting rid of the substantial abacus

Satellite Chasers lets you explore the real satellite catalog from your phone, including active satellites, rocket bodies, debris, and newly added objects soon after launch. Point your phone at the sky in AR to see what is overhead, or explore satellites over the globe. Track satellites, launches, predicted decays, and conjunctions, which are close approaches between objects in orbit that may indicate potential collision risk. Features include: - Track tens of thousands of objects cataloged in Earth orbit - Use AR to see satellites overhead through your phone’s camera - Play SatSpot, a satellite pointing challenge where your aim determines your check-in points - Get notifications for predicted decays, conjunctions, launches, and newly added satellites - Search launches and see what flew together - Read space news connected to satellites, launches, and orbital activity - View satellite images, descriptions, radio/transmitter data from SatNOGS, and select NASA 3D models - Customize filters to show the satellites you care about - Check in with nearby satellites, earn points, and compete on leaderboards - Favorite satellites and organize your personal Orbit of friends Whether you are a space nerd, ham radio operator, sky watcher, or just curious about what is passing overhead, Satellite Chasers gives you a playful way to explore orbit in real time.