Math Speed Calculation Trainer, Four Groups Of Mixed 24-point Speed Calculation Thinking Training, Addition, Subtraction, Multiplication And Di Calculator Features: 24-point quick calculator, math quick calculation trainer, suitable for 3-16 years old, 100 million + question bank, one and two digits within four groups, four arithmetic operations, intelligent question generation, automatic correction, interesting guide to save grades, auxiliary teaching, quick calculation training , exploit thinking, exercise the right in 24 o'clock develops thinking to exercise the right in, 24 o'clock games, turns boring exercises into games, and makes children's interests fly. 24 o'clock is called a puzzle, which is widely valued by the education industry and is also the main means of competition; 24 o'clock The boring practice has become a game, which has a essential effect on quick calculation and thinking ability. Adorable shape baby can't put it down: bear shape, lively and lively, cute and cute, high value, there are two types of pink bear and blue to choose from Built-in addition, subtraction, multiplication and di, posture table audio, compact and portable, and eye protection mode, built-in rechargeable lithium battery, lasting more than 20 hours Difficulty 1: record numbers, find the size, add within 10 Difficulty 2: Addition of one/two digits, subtraction of -digits, continuous addition, finding patterns Difficulty 3: Compound addition and subtraction, multiplication and di in the table, one-digit mixed operations Difficulty 4: Two-digit multiplication, di two-digit mixed operations, 24-point quick calculation Difficulty 5: Four arithmetic applications, 24-point calculation Difficulty 6: Compound four arithmetic, 24-point calculation Product Description: Material:Plastic/Electronic components. Color:Pink Suitable age:3-16. Charging time: 30mins. Power supply mode: 300mah lithium battery Charging mode:USB charging cable. Use time: 24 hours Product size:12x7.8x1.8cm(4.8x3.1x0.7in). Packing size:12.5x8x2cm(4.9x3.2x0.9in). Product net weight:60g/0.13lb. Product gross weight:87g/0.2lb. Instructiongs: Because the size of the product is measured manually, there may be errors. Package Contents: 1xQuick Calculation Trainer