小学分数乘法分配律练习题及答案

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小学分数乘法分配律练习题及答案

(712- 1 5 )×60 ( 1 6 + 8

9 )×18 =712×60- 1 5×60 = 1 6 ×18+ 8

9 ×18 =35-12 =3+16 =23 =19

( 5 6 - 5 9 )× 18 5 ( 1 10 + 1 5 )×5 = 5 6 × 18 5 - 5 9 × 18 5 = 1 10 ×5+ 1 5 ×5 =3-2 = 1

2 +1 =1 =1 1

2

( 8 9 + 4 27 )×27 90×( 2 18 + 7 30 ) = 8 9 ×27+ 4 27 ×27 =90× 2 18 +90× 7 30 =24+4 =10+21 =28 =31

( 3 5 + 2 25 )×25 1 6 ×(12+23 )

= 3 5 ×25+ 2 25 ×25 = 1 6 ×12+ 1 6 ×23 =15+2 =2+ 1

9 =17 =2 1

9

( 15 24 - 3 8 )× 6 15 24×( 7 24 + 5 6 + 3 4 ) = 15 24 × 6 15 - 3 8 × 6 15 =24× 7 24 +24× 5 6 +24× 3 4 = 1 4 - 3

20 =7+20+18 = 1

10 =45

(48+ 8 3 )× 1

24 ( 7 20 - 1 5 )×20

=48× 1 24 + 8 3 × 1

24 = 7 20 ×20- 1 5 ×20

=2+ 1

9 =7-4 =2 1

9 =3

( 5 6 - 5 9 )×18 ( 1 5 + 3

7 )×35 = 5 6 ×18- 5 9 ×18 = 1 5 ×35+ 3

7 ×35

=15-10 =7+15 =5 =22

4 17 ×( 3 4 + 17 2 ) 48×( 11 24 + 1 6 +

5 12 ) = 4 17 × 3 4 + 4 17 × 17 2 =48× 11 24 +48× 1

6 +48× 5 12 = 3

17 +2 =22+8+20 =2 3

17 =50

22 27 × 3 4 + 5 27 × 3 4 6 13 × 7 5 - 6 13 × 2 5 =( 22 27 + 5 27 )× 3 4 = 6 13 ×( 7 5 - 2 5 ) =1× 3 4 = 6 13 ×1 = 3 4 = 6 13

7 12 ×6 + 5 12 ×6 3 3 8 × 7 11 + 4 11 ×3 3 8 =( 7 12 + 5

12 )×6 =3 3 8 ×( 7 11 + 4 11 )

=1×6 =3 3

8 ×1

=6 =3 3

8

4 7 × 6 13 + 3 7 × 6 13 16

5 × 7 13 - 3 5 × 7 13 =( 4 7 + 3 7 )×

6 13 =( 16 5 - 3 5 )×

7 13 =1× 6 13 = 13 5 × 7 13

= 6 13 = 7 5

2 3 ×7+ 2 3 ×5 21× 3 7 + 4

7 ×21 =( 2 3 + 2 3 )×5 =21×( 3 7 + 4 7 ) =1×5 =21×1 =5 =21

63 100 ×101 6

77 ×78 = 63 100 ×(100+1) = 6 77 ×(77+1) =

63 100 ×100+ 63 100 = 6 77 ×77+ 6

77

×1 =63+ 63 100 =6+ 6 77

=63 63 100 =6 6 77

5 27 ×28 37× 3 35

= 5 27 ×(27+1) =(35+2)× 3 35 = 5 27 ×27+ 5 27 ×1 =35× 3 35 +2× 3 35 =5+ 5 27 =3+ 6 35

=5 5 27 =3 6 35

34× 34 35 6 13 ×12

=(35-1)× 34 35 = 6 13 ×(13-1)

=35× 34 35 -1× 34 35 = 6 13 ×13- 6

13 ×1

=34- 34 35 =6- 6 13

=33 1 35 =5 7 13

4 4

5 ×10 25 3

8 ×8 =(4+ 4 5 )×10 =(25+ 3

8 )×8

=4×10+ 4 5 ×10 =(25×8+ 3

8 )×8

=40+8 =200+3 =48 =203

3 4 5

×25 ( 1 5 + 3

7 )×7×5 =(3+ 4 5 )×25 = 1 5 ×7×5+ 3

7 ×7×5

=3×25+ 4

5 ×25 =7+15

=75+20 =22 =95

( 7 12 - 1 5 )×5×12 ( 5 6 - 5 9 )×6×18 = 7 12 ×5×12- 1 5 ×5×12 = 5 6 ×6×18- 5

9 ×6×18 =35-12 =90-60 =23 =30

7 10 ×101- 7 10 12× 6 13 + 6

13 = 7 10 ×(101-1) =(12+1)× 6 13 = 7 10 ×100 =13× 6 13 =70 =6

9 5 ×19+ 9 5 23× 3 4 + 3 4 = 9 5

×(19+1) =(23+1)× 3 4

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