Isbn: 9787559399120 - full vertical mental arithmetic cards (addition within 20 without carry and subtraction without borrow. full color version)/special training for young children(chinese edition) (1 resultados)

paperback. Condición: New. Language:Chinese.Paperback. Pub Date: 2023-11 Publisher: Heilongjiang Fine Arts Publishing House: Calculation is the most widely used mathematical knowledge in people's daily lives. and vertical calculation is an important part of calculation. Vertical calculation makes calculation no longer limited to an abstract result. but highlights the reasoning process. so that students' calculation process is presented more vividly and intuitively. In order to improve students' vertical calculation abi.…