OPERASI HITUNG

BILANGAN CACAH

OPERASI BILANGAN CACAH

Bilangan cacah merupakan himpunan bilangan bulat yang tidak negatif, dengan kata lain himpunan bilangan asli ditambah nol. Maka, bilangan cacah harus bertanda positif, sehingga himpunannya yaitu {0, 1, 2, 3 …}.

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Transition headline

Let’s start with the first set of slides

1

OPERASI PENJUMLAHAN

“

Di dalam penjumlahan bilangan cacah, berlaku sifat-sifat:

• sifat pertukaran, contohnya: a + b = b + a
• sifat pengelompokkan, contohnya: (a + b) + c = a (b + c)
• sifat identitas, contohnya: a + 0 = 0 + a

Contoh

Hitunglah penjumlahan dari

1). 145 + 14 = ….

2). 36 + 23 = ….

​

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OPERASI PENGURANGAN

“

“

“

Di dalam pengurangan bilangan cacah, berlaku sifat-sifat:

• a - b = c sama dengan b + c = a (a harus lebih besar dari b)
• a - b = b - a (bila keda bilangan nilainya sama, a = b)

di dalam pengurangan bilangan cacah tidak berlaku sifat identitas karena a - 0 ≠ 0 - a

​

Contoh :

Hitunglah pengurangan dari

357 – 125 = ….

45 – 34 = ….

​

Cara lain pengurangan

Thanks!

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