Children rapid response training I count application problems: less than 50 number subtraction(Chinese Edition)

Paperback. Pub Date :2013-01-01 92 Chinese Liaoning Children's Publishing House Child Rapid Response Training I count application less than 50 the number of subtraction is designed to develop students' speed calculation. A simple calculation of the ability to fully enhance the overall quality of students' math. discern write about understanding the singular 50 or less know 50 less than double the number two interesting exercise to compare the size ratio than the number of severity than the height than the length of the knowledge plane graphic recognize three-dimensional graphics recognize time understanding RMB know the year. month. day 10 Less than 10 less than the number the number of adders 20 within a few even the addition of even a few of the addition subtraction within 20 20 20 within a few subtraction within plus or minu...