3 3 5 1 2 2 24127042 72544836483254273618 3612 4515 8048 4228 604864485436 604864485436 30 564245 483242147254644860363624482480323612561464164832 18 481272 483656425418451548167028301542286448543636185614 １ ２ ３

③ =

① ⁼ 3 ^{⑧ =}

1

② =

⑩ =

⑨ =

⑤ = ^⑫ =

=

⑥ = ^⑬

④ = ^⑪ =

⑦ = ^⑭ =

① 例題

24 12

70 42

72 54

48 36

48 32

54 27

36 18

2

366

12

3

3

459

15 ¹

3

80 48

4

426

28

3

60 48

64 48

54 36

・次の分数を、

約分

① = 2 ^⑧ =

3

② = ^⑨ =

③ = ^⑩ =

④ = ^⑪ =

⑤ = ^⑫ =

⑥ = ^⑬ =

⑦ = ^⑭ =

30

② 確認

56 42

45

48 32

42 14

72 54

64 48

60 36 36

24

48 24

80 32

36 12

56 14

64 16

48 32

4 6

2

3

4 8

1

2

2 6

1

3

① = 2 ^⑧ =

5

② = ^⑨ =

③ = ^⑩ =

④ = ^⑪ =

⑤ = ^⑫ =

⑥ = ^⑬ =

⑦ = ^⑭ =

18

③ 確認

48 12

72

48 36

56 42

54 18

45 15

48 16 70

28

30 15

42 28

64 48

54 36

36 18

56 14

4 10

2

5

6 8

3

4

3 6

1

2

⑦ = ^⑭ =

⑥ = ^⑬ =

⑤ = ^⑫ =

④ = ^⑪ =

③ = ^⑩ =

② = ^⑨ =

・次の分数を、

約分

① = 1 ^⑧ =

4

④ 確認

72 54

30

24 12

60 24

72 18

32 16

48 32 64

16

36 24

45 15

28 14

48 16

48 36

45 30 15

2 8

1

4

2 4

1

2

4 6

2

3

= 2 ^{⑧ =}

① 1

② =

③ =

⑦ =

⑫ =

⑭

⑤ =

④ =

⑥ =

⑨ =

⑬ =

⑩ =

⑪ =

=

⑤ 定着

60 45

48 32

56 42

54 18 80 32

36 18

30 15

64 48 56 14

60 24

90 36

45 30

2

324

16

2

4

366

24 ²

3

⑦ = ^⑭ =

⑥ = ^⑬ =

⑤ = ^⑫ =

④ = ^⑪ =

③ = ^⑩ =

② = ^⑨ =

・次の分数を、

約分

① = 1 ^⑧ =

2

⑥ 確認

30 15

48

64 16

48 36

32 16

72 18

56 14 36

18

60 45

48 32

60 15

72 54

24 12

60 12 16

2 4

1

2

9 12

3

4

⑦ = ^⑭ =

⑥ = ^⑬ =

⑤ = ^⑫ =

④ = ^⑪ =

③ = ^⑩ =

② = ^⑨ =

① = 1 ^⑧ =

4

⑦ 確認

54 36

56

60 15

28 14

36 12

64 16

36 18 48

12

45 15

42 28

90 18

64 48

54 18

24 12 14

2 8₄

3 9

1

3

⑦ = ^⑭ =

⑥ = ^⑬ =

⑤ = ^⑫ =

④ = ^⑪ =

③ = ^⑩ =

② = ^⑨ =

・次の分数を、

約分

① = ^⑧ =

⑧ 確認

28 14

48

36 24

56 42

64 48

48 36

45 15 32

16

42 14

72 18

60 45

45 30

48 12

36 12 16

⑦ = ^⑭ =

⑥ = ^⑬ =

⑤ = ^⑫ =

④ = ^⑪ =

③ = ^⑩ =

② = ^⑨ =

① = ^⑧ =

⑨ 確認

56 42

64

72 54

54 36

48 32

60 45

32 16 30

15

42 14

56 14

48 36

36 24

42 28

72 18 48

・次の分数を、

約分

⑦ = ^⑭ 4 =

⑥ = ^⑬ =

⑤ = ^⑫ =

④ = ^⑪ =

③ = ^⑩ =

② = ^⑨ =

① = ^⑧ =

⑩ 仕上げ

24 12

42 28

36 40 16

48 36

54 36

48 32 75

30

72 54

70 28

18 14

16 12

24 21

28 14

⑦ 3 = ^⑭ =

⑥ = ^⑬ =

⑤ = ^⑫ =

④ = ^⑪ =

③ = ^⑩ =

② = ^⑨ =

① = ^⑧ =

⑪ 仕上げ

48 40

30

36 18

54 18

14 10

18

72 54 45

30

24 12

36 24

56 42

64 16

28 14

42 14 15

⑦ = ^⑭ 8 =

⑥ = ^⑬ =

8 4

⑤ = ^⑫ =

④ = ^⑪ =

③ = ^⑩ =

② = ^⑨ =

・次の分数を、

約分

① = ^⑧ =

⑫ 仕上げ

27 12

48

45 30

24 16

56 42

60 15 48

16

60 36

54 36

36 16

54 18

64 48

10 12

⑦ 6 = ^⑭ =

⑥ = ^⑬ =

⑤ = ^⑫ =

④ = ^⑪ =

8 4

③ 3 = ^⑩ =

② = ^⑨ =

① = ^⑧ =

⑬ 仕上げ

21 54

42 28

72 54

14

48 36 48

32

45 15

36 18

56 14

28 14

60 48

45 30 36

⑦ = ^⑭ 9 =

⑥ = ^⑬ =

6 3

⑤ = ^⑫ =

④ = ^⑪ =

③ = ^⑩ =

② = ^⑨ =

・次の分数を、

約分

① = ^⑧ =

⑭ 仕上げ

24 21

48

36 24

16 14

24 12

32 16 60

45

36 12

72 54

40 32

64 48

64 16

15 16

⑤ = ^⑩ =

④ = ^⑨ 4 =

③ = ^⑧ =

② = ^⑦ =

① = ^⑥ =

⑮ ⼒だめし

18 15

28

54 18

36 18 72 40

80 32 48

36

75 30

72 27

32 16

⑤ = ^⑩ =

④ = ^⑨ 9 =

③ = ^⑧ =

② 2 = ^⑦ =

・次の分数を、

約分

① = ^⑥ 8 =

⑯ ⼒だめし

16

24

60 45

48 32 24

48 12 30

15

72 18

27 15

32 16

3 4

1 2

⑦ = ^⑭ =

2

⑥ = ^⑬ =

4

2

3 3

3

3 1

⑤ = ^⑫ =

5

④ = ^⑪ =

4

5

3 2

5

1 3

③ = ^⑩ =

2

② = ^⑨ =

3

1 4

1 2

① = ^⑧ =

3 3

① 例題 答え

24 12

70 42

72 54

48 36

48 32

54 27

36 18

2

366

12

3

3

459

15 ¹

3

80 48

4

426

28

3

60 48

64 48

54 36

2 4 6 8 6 10 6 8 3 6

1

2 3

4 3

5 3

4 1

2

8 10 6 10 4 6 2 4 6 8 4 6

4

5 3

5 2

3 1

2 3

4 2

3

3 4

3 2

⑦ = ^⑭ =

4

⑥ = ^⑬ =

3

5

1 1

4

2 3

⑤ = ^⑫ =

5

④ = ^⑪ =

3

3

2 3

4

3 2

③ = ^⑩ =

4

② = ^⑨ =

2

1 1

・次の分数を、

約分

2 1

① = ^⑧ =

3 3

② 確認 答え

56 42

45

48 32

42 14

72 54

64 48

60 36

6

369

24 ²

3

4

488

24 ¹

2

80 32

2

366

12 ¹

3

56 14

64 16

48 32

6 8 4 6 4 10 2 6 6 8

3

4 2

3 2

5 1

3 3

4

2 8 6 9 6 8 6 10 2 8 4 6

1

4 2

3 3

4 3

5 1

4 2

3

30

2

2 3

① = ^⑧ =

5 4

② = ^⑨ =

2 1

③ = ^⑩ =

4

3

1 1

4

3 1

④ = ^⑪ =

4

⑤ = ^⑫ =

3

3

2 1

3

3 1

⑥ = ^⑬ =

4

⑦ = ^⑭ =

3 4

2

1 1

③ 確認 答え

48 12

72

48 36

56 42

54 18

45 15

48 16

4

7010

28

5

3

306

15 ¹

2

42 28

6

648

48

4

54 36

36 18

56 14

2 8 6 8 4 6 6 8 3 9

1

4 3

4 2

3 3

4 1

3

6 9 2 8 2 6 2 6 2 4 2 8

2

3 1

4 1

3 1

3 1

2 1

4

18

1

・次の分数を、

約分

1 1

① = ^⑧ =

4 2

② = ^⑨ =

3 2

③ = ^⑩ =

4

3

3 1

2

1 1

④ = ^⑪ =

2

⑤ = ^⑫ =

3

4

1 2

3

2 3

⑥ = ^⑬ =

5

⑦ = ^⑭ =

2 3

4

1 2

④ 確認 答え

72 54

30

24 12

60 24

72 18

32 16

48 32

2

648

16 ¹

4

4

366

24 ²

3

45 15

2

284

14 ¹

2

48 16

48 36

45 30

6 8 2 4 3 9 4 10 2 4

3

4 1

2 1

3 2

5 1

2

2 6 3 6 2 8 4 6 6 8 6 9

1

3 1

2 1

4 2

3 3

4 2

3

15

3 5

1 2

⑦ = ^⑭ =

2

⑥ = ^⑬ =

4

4

3 2

3

2 3

⑤ = ^⑫ =

5

④ = ^⑪ =

3

2

2 1

4

3 1

③ = ^⑩ =

4

② = ^⑨ =

3

2 1

1 2

① = ^⑧ =

2 5

⑤ 確認 答え

60 45

30

48 32

56 42

54 18

36 18

64 48

2

324

16

2

4

366

24 ²

3

60 24

4

8010

32

5

56 14

90 36

45 30

9 12 4 6 4 10 6 8 3 6

3

4 2

3 2

5 3

4 1

2

2 8 3 6 3 9 6 8 4 10 6 9

1

4 1

2 1

3 3

4 2

5 2

3

15

5 2

1 1

⑦ = ^⑭ =

4

⑥ = ^⑬ =

4

4

3 1

2

2 1

⑤ = ^⑫ =

3

④ = ^⑪ =

4

3

1 1

4

1 1

③ = ^⑩ =

2

② = ^⑨ =

4

3 3

・次の分数を、

約分

1 1

① = ^⑧ =

2 4

⑥ 確認 答え

30 15

48

64 16

48 36

32 16

72 18

56 14

2

364

18 ¹

2

9

6012

45 ³

4

48 32

3

6012

15 ¹

4

72 54

24 12

60 12

3 6 2 8 4 6 6 8 2 8

1

2 1

4 2

3 3

4 1

4

6 8 2 6 2 4 2 8 2 4 2 10

3

4 1

3 1

2 1

4 1

2 1

5

16

2 3

1 1

⑦ = ^⑭ =

4

⑥ = ^⑬ =

2

2

1 1

3

2 1

⑤ = ^⑫ =

3

④ = ^⑪ =

4

4

1 1

4

2 1

③ = ^⑩ =

3

② = ^⑨ =

3

1 3

1 1

① = ^⑧ =

4 5

⑦ 確認 答え

54 36

56

60 15

28 14

36 12

64 16

36 18

2

488

12

4

3

459

15 ¹

3

42 28

2

9010

18

5

64 48

54 18

24 12

6 9 2 12 4 6 2 4 2 8

2

3 1

4 2

3 1

2 1

4

6 8 2 8 2 6 2 4 2 6 2 4

3

4 1

4 1

3 1

2 1

3 1

2

14

3 4

3 1

⑦ = ^⑭ =

4

⑥ = ^⑬ =

4

3

3 1

4

1 1

⑤ = ^⑫ =

4

④ = ^⑪ =

3

3

2 3

3

1 1

③ = ^⑩ =

2

② = ^⑨ =

3

1 2

・次の分数を、

約分

1 3

① = ^⑧ =

2 4

⑧ 確認 答え

28 14

48

36 24

56 42

64 48

48 36

45 15

2

324

16 ¹

2

2

426

14 ¹

3

72 18

9

6012

45 ³

4

45 30

48 12

36 12

2 4 4 6 2 8 6 8 6 8

1

2 2

3 1

4 3

4 3

4

6 9 2 6 6 8 3 9 2 8 2 6

2

3 1

3 3

4 1

3 1

4 1

3

16

4 3

3 1

⑦ = ^⑭ =

4

⑥ = ^⑬ =

3

2

2 2

3

1 1

⑤ = ^⑫ =

4

④ = ^⑪ =

4

4

3 2

3

3 3

③ = ^⑩ =

4

② = ^⑨ =

3

1 2

1 3

① = ^⑧ =

2 4

⑨ 確認 答え

56 42

64

72 54

54 36

48 32

60 45

32 16

3

306

15

2

2

426

14 ¹

3

56 14

6

488

36

4

36 24

42 28

72 18

6 8 6 8 2 8 6 9 9 12

3

4 3

4 1

4 2

3 3

4

4 6 6 8 4 6 2 4 4 6 2 8

2

3 3

4 2

3 1

2 2

3 1

4

48

9 3

3 4 1

⑦ = ^⑭ =

4

⑥ = ^⑬ =

4

2

3 2

8

3 1

⑤ = ^⑫ =

4

④ = ^⑪ =

3

3

2 7

5

7 2

③ = ^⑩ =

9

② = ^⑨ =

2

1 2

・次の分数を、

約分

2 2

① = ^⑧ =

5 5

⑩ 仕上げ 答え

18 14

54

42 28

16 12

24 21

72 54

28 14

6

7515

30 ²

5

2

244

12 ¹

2

48 36

2

405

16

70 28

48 32

36

7 9 4 6 6 8 3 4 6 8

2

3 3

4

3

4

4 10 6 9 7 8 2 4 4 6 1 9

2

5 2

3

1

2 2

3

36

3 2

3 1 1

⑦ = ^⑭ =

6

⑥ = ^⑬ =

3

4

1 1

7

2 3

⑤ = ^⑫ =

3

④ = ^⑪ =

2

2

1 5

4

5 1

③ = ^⑩ =

6

② = ^⑨ =

2

1 1

2 3

① = ^⑧ =

3 4

⑪ 仕上げ 答え

48 40

30

36 18

54 18

14 10

18

72 54

6

459

30

3

2

244

12 ¹

2

36 24

6

568

42

4

64 16

28 14

42 14

5 6 2 4 4 6 2 6 1 6

1

2 2

3 1

3

2 8 3 6 5 7 6 8 2 4 2 6

1

4 1

2

3

4 1

2 1

3

15

5 4

3 8 4

⑦ = ^⑭ =

4

⑥ = ^⑬ =

8 2

4

4 1 3

3

2 1

⑤ = ^⑫ =

3

④ = ^⑪ =

3

4

2 2

3

4 1

③ = ^⑩ =

9

② = ^⑨ =

5

3 1

・次の分数を、

約分

1 4

① = ^⑧ =

3 9

⑫ 仕上げ 答え

27 12

48

45 30

24 16

56 42

60 15

2

486

16 ¹

3

6

6010

36 ³

5

54 36

4

369

16

54 18

64 48

10

4 9 6 9 4 6 1 2 6 8

2

3 2

3

3

4

2 6 2 8 2 3 3 12 6 8 4 5

1

3 1

4

1

4 3

4

12

3 5

6 3 2

⑦ = ^⑭ =

7

⑥ = ^⑬ =

4

4

3 4

2

1 3

⑤ = ^⑫ =

2

④ = ^⑪ =

3 8

3

2 4 1

2

3 1 2

③ = ^⑩ =

7

② = ^⑨ =

3

1 1

2 1

① = ^⑧ =

3 4

⑬ 仕上げ 答え

21 54

42 28

72 54

14

48 36

4

486

32

3

3

459

15 ¹

3

36 18

2

568

14

4

28 14

60 48

45 30

1 7 4 6 2 4 6 8 3 7

2

3 1

2 3

4

2 4 6 9 1 2 6 8 8 10 6 9

1

2 2

3

3

4 4

5 2

3

36

5 4

1 9 3

⑦ = ^⑭ =

2

⑥ = ^⑬ =

6 2

2

3 1 1

8

3 1

⑤ = ^⑫ =

4

④ = ^⑪ =

3

3

2 7

4

7 1

③ = ^⑩ =

8

② = ^⑨ =

3

1 3

・次の分数を、

約分

3 4

① = ^⑧ =

4 5

⑭ 仕上げ 答え

24 21

48

36 24

16 14

24 12

32 16

9

6012

45 ³

4

2

366

12 ¹

3

72 54

4

405

32

64 48

64 16

15

7 8 4 6 6 8 1 2 2 4

2

3 3

4

1

2

6 8 2 6 7 8 2 4 2 8 3 5

3

4 1

3

1

2 1

4

16

2 7

1 1

⑤ = ^⑩ =

3

④ = ^⑨ =

8

1

5 2

3 4 1

③ = 2 ^⑧ =

5 2

② = ^⑦ =

6 5

3 5

① = ^⑥ =

4 9

⑮ ⼒だめし 答え

18 15

28

54 18

36 18 72 40

80 32 48

36

75 30

72 27

32 16

6 8

3

4

5 6

4 10

2

5

5 9

6 15

2

5

2 4

1

2

3 8

1 7

2 4

1

2

2 6

1

3

2 8

3 1

⑤ = ^⑩ =

4

④ = ^⑨ =

9

2

4 3

5 9 3

③ = 1 ^⑧ =

2 1 1

② = ^⑦ =

8 4

・次の分数を、

約分

1 8 1

① = ^⑥ =

2 3

⑯ ⼒だめし 答え

16

24

60 45

48 32 24

48 12 30

15

72 18

27 15

32 16

3 6

1

2

1 8

2 8

1

4

1 3

2 8

1

4

4 6

2

3

5 9

3 8

2 4

1

2

9 12

3

4