
Matematika Kelas 6
Presentation
•
Mathematics
•
6th Grade
•
Hard
Cecep Awaludin
Used 6+ times
FREE Resource
10 Slides • 0 Questions
1
By Cecep Awaludin
Sifat Komutatif ( a + b = b + a )
contoh : 20 + 10 = 10 + 20
Sifat Asosiatif ( a + b + c = (a+b) + c )
contoh : (20+10) + 30 = 20 + (10+30)
Sifat Distributif ( a x (b+c) = (axb)+(axc) )
contoh : 5 x (2 + 12) = (5x2) + (5x12)
2
pertanyaan : 1. (48 x 25) - (48 x 10) = 48 x (25 - 10) Operasi hitung di atas menggunakan sifat . . . .
a. Asosiatif
b. Komutatif
c. Distributif
Jawabannya adalah Distributif
By Cecep Awaludin
3
a. 20
b. 30
c. 10
d. 15.
Jawaban : 100-20 = 80 maka (3 x n) + 20 = 80 nilai "n" adalah 20
sehingga (3x20)+20 = 60 + 20 = 80
jadi 100-20 = 80 sama dengan (3x20) + 20 = 80
4
a. 5
b. 10
c. -10
d. -5
Jawaban : 20 : (-10) = -2 → -2 + 5 = 3 → 3 - (-2) = 3 + 2 → 5
5
6
by. cecep awaludin
dari hasil gambar disamping didapatlah hasil Faktorisasi prima 3x5x5 atau 3x52
7
FPB adalah Faktor Persekutuan Terbesar
KPK adalah Kelipatan Persekutuan Terkecil
8
contoh soal FPB :
Nadia memiliki 2 potong pita. Panjang masing-masing pita 12 cm dan 20 cm. Pita tersebut akan dipotong menjadi beberapa potongan yang sama banyak. Ukuran terpanjang untuk setiap potongnya adalah .... cm. gunakan rumus FPB (ada dibagian atas)
Jawab :
12
⋀
2 6
⋀
2 3
jadi FP = 22 x 3
20
⋀
2 10
⋀
2 5
jadi FP = 22 x 5
sehingga Faktorisasi primanya adalah
12 = 22 x 3
20 = 22 x 5
maka FPB = 22 atau 4
jadi jawabannya adalah
4 cm
9
contoh soal KPK :
Lampu A menyala setiap 6 menit sekali, lampu B setiap 8 menit sekali dan lampu C setiap 12 menit sekali. Pada pukul 09.46 ketiga lampu menyala bersama-sama. Ketiga lampu akan menyala bersama lagi pada pukul . . . . (09.46 + 24 = ......)
Jawab :
6
⋀
2 3
jadi FP = 2 x 3
8
⋀
2 4
⋀
2 2
jadi FP = 23
sehingga Faktorisasi primanya adalah
6 = 22 x 3
8 = 22 x 4
12 = 22 x 3
maka KPK = 23x3 = 24
jadi jawabannya adalah
09.46 + 24 = 09.70 = 10.10
12
⋀
2 6
⋀
2 3
jadi FP = 22 x 3
10
⋀
2 10
⋀
2 5
FP = 2x2x5
FP= 22 x 5
By Cecep Awaludin
Sifat Komutatif ( a + b = b + a )
contoh : 20 + 10 = 10 + 20
Sifat Asosiatif ( a + b + c = (a+b) + c )
contoh : (20+10) + 30 = 20 + (10+30)
Sifat Distributif ( a x (b+c) = (axb)+(axc) )
contoh : 5 x (2 + 12) = (5x2) + (5x12)
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