按规律填一填。

9×1=9 ······( )个9相加,比10少1;

9×2=18 ······( )个9相加,比20少2;

9×3=( )······( )个9相加,比( )少( );

9×4=( )······( )个9相加,比( )少( );

9×5=( )······( )个9相加,比( )少( );

9×6=( )······( )个9相加,比( )少( );

9×7=( )······( )个9相加,比( )少( );

9×8=( )······( )个9相加,比( )少( );

9×9=( )······( )个9相加,比( )少( )。

二、根据乘法口诀写算式。

( )×( )=( )

三九二十七

( )×( )=( )

( )×( )=( )

四九三十六

( )×( )=( )

( )×( )=( )

七九六十三

( )×( )=( )

三、送信。

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