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乘法交换律

乘法交换律. 在括号内填上适当的数或符号. 1. 11 × 50 = ( ) × 11. 50. 2. 30 × 200 = 200 × ( ). 30. 3. 60 × a = ( ) × ( ). a. 60. ×. 4. = ( ) × ( ). 判断：. 1 ， 54 × 72 = 72 × 54 ( ). 2, 890 × 120 = 120 × 980 ( ).

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乘法交换律

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  1. 乘法交换律

  2. 在括号内填上适当的数或符号 1. 11 × 50 = ( ) × 11 50 2. 30 × 200 = 200 × ( ) 30 3. 60 × a = ( ) × ( ) a 60 × 4. = ( ) × ( )

  3. 判断： 1，54 ×72 = 72 ×54 ( ) 2, 890 × 120 = 120 × 980 ( ) 3, 160 ×38 = 38 + 160 ( )

  4. 在括号内填上适当的数或符号 1, 16 × ( ) = 127 × 16 127 2, ( ) × 573 = ( ) ×101 101 573 1 1 3, ( ) × 702 = 702 × ( ) × 4, 48 ( ) 81 = 81 ( ) 48 ×

  5. 每组中，各选一题，独立计算 。 206 × 341 352 × 143 333 ×297 341 × 206 297 × 333 143 × 352

  6. 不计算，判断怎样才能算起来简便 5 × 87 700 × 542 180 × 635 140 × 251 17 ×234 109 ×606

  7. 怎样简便就怎样算 44 × 213 302 ×512 310 × 2680 635 × 746

  8. 你会算吗？ 1. 50 × 243 × 2 2. 25 × 125 × 8 ×4

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