口算乘法
人教新课标版三年级数学上册
1.口算.
6×4 5×7 8×6
3×8 4×9 9×9
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:
10×3 4×10 5×10 10×6
坐旋转木马每人2元,9人要多少钱?10人要多少钱?
2×9=18(元)
2×10=20(元)
练习:
20×7 200×7 2000×7
练习:
20×4 200×4 2000×3 30×4 600×4 3000×7
已知:
=
+
+
+
+
=
+
求:
=( )个
=( )个
思维训练
2
4
口算1:
2×4= 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 = 50×3 =
50 ×4 = 40 ×5 = 70 ×4 =
9 ×60 = 80×3 = 60×8 =
口 算4: