《 廿一世紀 現代數學 》 5 下 A 課本

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《廿一世紀 現代數學》

5 下 A 課本

3小數加減

14.3元

12.6元

1 2.6

1 4.3

+

_

12.6 + 14.3  2.5

2.5

1

2 6.9

= 26.9  2.5

2 4.4

= 24.4 (元)

_

12.6 + 12.6 2.5

1 2.6

1 2.6

_

+

= 2.5

= (元)

_

2.5

2

25.2

2 5.2

22.7

2 2.7

1 3.8

= + 16.5

_

3 1.6

= (元)

+

1 6.5

_

3

31.6 13.8 + 16.5

17.8

34.3

1 7.8

3 4.3

1 1.8 1

_

24.29 8.63

1 2.4 8

+

_

8.6 3

_

4

11.81 12.48 + 8.63

=_____________

=_____________

15.66

2 4.2 9

1 5.6 6

2 6.4 3

_

1 5.8 0

+

7.0 9

5

26.43  15.8 + 7.09

=_____________

10.63 + 7.09

1 0.6 3

=_____________

17.72

1 7.7 2

3.8

7.2

+

6.4

1

3.8 + 7.2 – 6.4

= – 6.4

11

11.0

4.6

=

4.6

11.5

4.7

6.8

+

10.9

17.7

2

11.5 – 4.7 + 10.9

= + 10.9

6.8

17.7

=

3

7.12 + 6.47 – 5.11

=

8.48

4

21.24 – 7.35 + 11.43

=

25.32

_

1

28.3 ( 17.5 + 8.6 )

_

= 28.3 16.5

_

2

16.21 ( 24.82 + 17.51 )

_

= 16.21

=

= 2.2

7.31

8.9

1 2.8

_

= 45.3 9.6

2 8.5

+

4.0

_

9.6

3

12.8 + 28.5 + 4  9.6

= 35.7

4 5.3

3 5.7

_

_

21.7 16.4 3.2 + 7.9

2 1.7

_

_

1 6.4

5.3 3.2 + 7.9

= __________________

= __________________

_

= __________________

+

4

5.3

2.1 + 7.9

3.2

10

2.1

7.9

1 0.0

_

_

9.6 ( 3.7 2.5 ) + 0.7

_

= 9.6 + 0.7

= __________________

= __________________

5

*

1.2

8.4 + 0.7

9.1

1

3.9 – (1.9+ 0.8)

=

3.9 – 2.7

=

1.2

2

21.42 – (13.52– 8.27)

=

21.42 – 5.25

=

16.17

3

6.17 + 3.21+ 4.3 – 5.14

=

13.68 – 5.14

=

8.54

4

3.13 + 2.11– 1.12 + 6.58

=

5.24 – 1.21 + 6.58

=

4.12+ 6.58

10.7

=

_

2.3 + 1.5 1.4

_

3.8 1.4

= __________________

= ________ (公斤)

1

2.4

_

+

= _______________

= ________ (升)

2

28.7

13.8

8.9

14.9 + 8.9

23.8

50 元買風車和風鈴各一個，應找回多少元 ?

_

50 ( 24.5 + 18.2 )

_

50 42.7

= _______________

= ________ (元)

( 24.5 + 18.2 ) (元)

3

7.3

_

_

( )

_

2.38 0.98

= _______________

_

( ) (米)

= ________ (米)

4

2.38

1.59

0.61

1.59

0.61

1.4

12.4

5.8

+

1

6.9

12.4 + 5.8 – 6.9

=

18.2 – 6.9

18.2

11.3

=

11.3

32.47

_

8.92

2

+

3.61

32.47 – 8.92+ 3.61

=

23.55 + 3.61

23.55

27.16

=

27.16

3.61

2.39

+

3

3.70

3.61 + 2.39 – 3.7

=

6 – 3.7

6.00

2.3

=

2.30

36.41

_

2.28

4

+

16.67

36.41 – 2.28+ 16.67

=

34.13 + 16.67

34.13

50.8

=

50.80

5

6

7

8

0.3

3.7 – (2.1+ 1.3) =

2.5

4.8 – (5.9– 3.6) =

8.7 + 4.3+ 5.2 – 6.1 =

12.1

13.8 – 2.4 – 5.1 + 4.9=

11.2

9

4.2

3.8

8.0

2.5

5.5

+

4.2 + 3.8– 2.5

= 5.5 (公斤)

26.0

4.8

21.2

38.5

59.7

+

10

26 – 4.8 + 38.5

= 59.7 (元)

1.40

0.14

1.54

0.07

1.47

+

11

1.4 + 0.14– 0.07

= 1.47 (米)

28.19

11.21

16.98

14.30

31.28

+

12

28.19 – 11.21 + 14.3

= 31.28 (公斤)

12.4

4.9

7.5

8.3

3.4

4.9

13

12.4 – (8.3 – 3.4)

= 7.5 (公斤)

21.21

15.21

6.00

8.75

6.46

15.21

+

14

21.21 – (8.75 + 6.46)

= 6 (升)