一、背诵1~6的乘法口诀。 (1)乘法的意义。
( 4 )个( 3 )
加法算式:(
3+3+3+3
乘法算式:(
3X4
) )
(2)乘法算式的读法和写法、含义和口诀。
3X6读作(
Hale Waihona Puke 3乘6表示( 6 )个( 3
口诀( 三六十八
) ) )
4乘5写作(
4X5
)
表示( 5 )个( 4 )
口诀(
四五二十
)
(3)写出乘法算式各部分的名称。
3 X 5 = ( 15 ) ( 因数 () 因数 ) ( 积 ) (4)列式计算。
一个因数是3,另一个因数是6, 积是多少?
3X6=18 或 6X3=18
一个因数是4,另一个因数是5, 积是多少?
4X5=20 或 5X4=20
1X1=1
1X2=2 1X3=3 1X4=4 1X5=5 1X6=6
2X2=4 2X3=6 2X4=8 2X5=10 2X6=12
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