毫米、分米的认识(国外英文资料).docVIP

毫米、分米的认识(国外英文资料) Mm, know the decimeter Teaching target (a) to enable students to understand the unit of length mm and 1 mm. The initial establishment of decimeter decimeter, 1 length 1 meters =10 concept; know 1 decimeter decimeter, =10 cm, 1 cm, =10 mm. (two) cultivate students hands-on ability, and make them develop a careful and conscientious attitude in practice Teaching emphases and difficulties (a) the teaching focus: understanding and mm and between meters, decimeter decimeter and mm in rate. (two) teaching difficulties: understanding of unit length decimetre and mm. Teaching process design (a) review preparation Q: how many units of length should we use when measuring the length of an object? (meters, centimeters) What is their rate of entry? 1 meters =100 cm (blackboard writing) Please use gesture to indicate how long it is about 1 meters How long is it about 1 centimeters? How many centimeters does 1 meters equal? (blackboard writing: 1 meters =100 cm) (two) learn new lessons 1. know mm (1) please measure the rubber with a ruler. The thickness of the rubber is not enough 1 centimeters. Would you please measure the length of the rubber again? (more than 4 centimeters) so, exactly, how thick is this eraser? How much longer? In order to accurately measure the thickness and length of rubber, will use a small unit of length - cm mm. Now we have come to know mm. (a part of the subject: blackboard writing understanding 1 mm mm) how long? (2) ask the students to come up with their own small ruler, with two pencil tip on the ruler pointed out that the length of 1 cm. (the teacher walks) with the right hand pen count a few small lattice 1 cm? (10) divide the average of 1 centimeters into 10 small squares, each of which is 1 millimeters long. Please point out 1 millimeters, 2 millimeters and 5 millimeters with your pen point Length (3) would you please count the length of 10 millimeters? 10 mm, which length is the same length? (1 centimeters) how many millimeters a