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Calculate the size of the title card with your mouth.
Generally, it is the size of A4 paper, and the size is 2 1 cm x29. Seven centimeters.

The "Oral Calculation Question Card" is a book published by Sichuan Fine Arts Publishing House on 20 10, and the author is Song Side. This book is based on the new curriculum standard and based on the teaching materials of the new curriculum standard, and is dedicated to inspiring and training primary school students' mathematical thinking. Through mental calculation, oral calculation, quick calculation and clever calculation, the pupils' mind and quick reaction ability are exercised, their understanding of mathematical concepts is deepened, their interest in learning mathematics is cultivated, and a good foundation is laid for them to form a rigorous and scientific way of thinking.