2.B
3.D
4.270
Form: 339. 12mm? 2.5 12cm 2.5 12cm 2.5 12cm? 5dm 9dm 10 5π
5.37.68
6.3.768
7.720
8.25
9.53.24cm?
10. 10.36cm?
1 1. 1 1.44cm?
12. 17 1.5cm?
13.57cm?
① Characteristics of Montessori Sensory Training Teaching Aids
(1) isolation * * *
In Montessori teaching AIDS, each teaching aid only trains one kind of pe