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PECAHAN
Bilangan yang digunakan untuk
menyatakan bagian-bagian benda jika
benda dibagi-bagi menjadi beberapa
bagian yang sama
1 bagian
Seluruhnya 2 bagian
2
1 Satu per dua = seperdua = setengah
Bagian yang diarsir menyatakan pecahan
4
3 Pembilang
Penyebut
Membandingkan Pecahan
•Gambar
•Garis Bilangan
•Ilustrasi
•Perkalian silang
2
1
4
2
2
1
4
2
2
1
4
2
=
?
2
1
4
2
2
1
4
2
=
0
12
2
12
1
12
3
12
4
12
5
12
6
12
8
12
7
12
9
12
10
12
11
12
12
0
6
1
6
2
6
3
6
4
6
5
6
6
0
4
1
4
2
4
3
4
4
0
3
1
3
2
3
3
0
2
1
2
2
Membandingkan 2 pecahan
0
4
1
4
2
4
3
4
4
0
3
1
3
2
3
3
0
2
1
2
2
Membandingkan 2 pecahan
5
3

8
3
5
3
5
2
8
5
6
4
24
15
24
16
>
<
>
<
Membandingkan 2 pecahan
5
3
8
3
5
3
5
2
8
5
6
4
24 15
15 10
30 32
>
<
>
4
3
=
X 2
X 2
8
6
=
X 4
X 4
32
24
Pecahan Senilai
4
3
=
: 2
: 2
32
24
=
: 4
: 4
8
6
Pecahan Senilai
12
n
4
3
Pecahan Senilai
=
X 3
X 3
n = 9
Pecahan Desimal
Pecahan dengan penyebut 10, 100, 1000, dst disebut pecahan desimal
Penulisan: Nilai tempat satuan dan persepuluhan dipisahkan dengan “Koma”
08
,
0
100
8

3
,
0
10
3

25
,
1
100
125

015
,
0
1000
15

Mengubah bentuk pecahan biasa menjadi
bentuk pecahan desimal
....
4
3

75
,
0
100
75
25
4
25
3
4
3





Cara I
Ubahlah menjadi pecahan yang berpenyebut 10, 100, 1000 atau 10000 dst
75
,
0
4
3

Jadi
4
:
3
4
3

Cara II
Dengan pembagian bersusun
Mengubah Bentuk desimal ke pecahan biasa
Desimal terbatas
Contoh:
0,5
0,75
0,125
2,4
Desimall tak terbatas berulang
Contoh:
0,33333333333333333
0,71717171717171717
0,11111111111111111
Desimal tak berulang tak terbatas
Contoh:
1,4142135623731
Mengubah bentuk pecahan biasa menjadi
bentuk persen
....
4
3

Cara I:
Ubah menjadi pecahan berpenyebut 100
Cara II
Kalikan dengan 100%
Mengubah bentuk persen menjadi
bentuk pecahan biasa
80% =
b
a
Bilangan Rasional dan Irrasional
Bilangan rasional adalah bilangan yang dapat dinyatakan dalam bentuk
b
a

, dengan a dan b bil bulat, dan b 0
Cattn: Jika dalam bentuk desimal, bilangan rasional berupa desimal terbatas
atau desimal tak terbatas berulang. Sedangkan bilangan irrasional
dalam desimal tak terbatas tak berulang

2
7
1
1.41421356237309504880168872420969807856967187537694
0.14285714285714285714285714285714285714285714285714
3.14159265358979323846264338327950288419716939937510
Bilangan Rasional dan Irrasional
Penjumlahan Pecahan
8
3
4
2
4
1


4
1

4
2
4
3

Penjumlahan Pecahan
6
2
4
1
2
1


4
3
4
1
4
2
4
1
2
1




4
3
4
1
 
0
2
Pengurangan Pecahan
4
3
4
1
 
4
2
4
3
2
1
 
2
2
Pengurangan Pecahan
4
3
2
1
 
4
2
4
3
4
1
 
Perkalian Pecahan
4
3
5
2
 
20
6
0
4
1
4
2
4
3
4
4
0
5
3
5
4
5
1
5
2
5
5
0
4
1
4
2
4
3
4
4
5
3
5
4
5
1
5
2
5
5
4
3
5
2
 
20
6
Perkalian Pecahan
b
a
d
c
 
d
b
c
a
.
.
Pembagian Pecahan
1
2
1
:  ........
Pada 1 ada berapa
an
2
1
an
2
1
1 = ….x
2
1
2
1
2
1
:  
2 1
1
2

Pembagian Pecahan
d
c
: 
c
d
b
a

b
a
0
,
, 
d
c
b

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