口算乘法,人教新课标版三年级数学上册,1.口算.64 57 86 38 49 99,2.口答.(1)6个十是多少?12个十呢?20个十呢?(2)40是多少个十?70是几个十?150呢?,练习:103 410 510 106,坐旋转木马每人2元,9人要多少钱?10人要多少钱?,29=18(元),210=20(元),练习:207 2007 20007,练习:204 2004 20003 304 6004 30007,已知:,=,+,+,+,+,=,+,求:,=( )个,=( )个,思维训练,2,4,将左右两边相等的算式和得数用线连起来.,7008 1200509 56003400 450,307 24006004 40008500 210,口算1:,24= 20 4= 200 4= 6 3= 60 3= 600 3= 40 8= 300 6= 20 6=,50 4= 200 3= 400 2= 30 5= 90 7= 50 9= 20 7= 6 50= 500 8=,口算2:,30 8= 40 6 = 80 4 = 60 7 = 90 2 = 70 6 = 100 4 = 70 3 = 200 5 =,口 算3:,300 5 = 200 3 = 503 = 50 4 = 40 5 = 70 4 = 9 60 = 803 = 608 =,口 算4:,
