
BILANGAN BULAT
Presentation
•
Mathematics
•
6th Grade
•
Practice Problem
•
Hard
Yustinus Madu
FREE Resource
4 Slides • 1 Question
1
BILANGAN BULAT
2
PENJUMLAHA BILANGAN BULAT
Operasi Penjumlahan dan Pengurangan Bilangan Bulat
Ria diberikan uang oleh Ibunya, kemudian Ria membeli Roti sebanyak 3 buah. Karena telah membantu kakaknya, Ria dihadiahi oleh kakaknya 4 buah roti. Ria anak yang baik hati, Ia memberikan rotinya kepada adiknya sebanyak 2 buah. Berapakah jumlah roti Ria sekarang?
Penyelesaian:
Untuk mengetahui berapa jumlah roti yang dimiliki Ria, maka dapat dijabarkan melalui ilustrasi berikut:
3 + 4 + 2 = 9
3
Sifat-sifat Operasi Penjumlahan dan Pengurangan Bilangan Bulat
Sifat Tertutup
a + b = c, jika adanbadalah bilangan bulat, maka cjuga adalah bilangan bulat. Hal ini juga berlaku pada pengurangan. Jika a – b = c, jika adan badalah bilangan bulat, maka cjuga adalah bilangan bulat
contoh:
5 + 7 = 12
2 – 5 = –3
4
Sifat Komutatif
a + b = b + a
Contoh:
5 + 7 = ….
5 – 7 = ….
Perhatikan soal nomor 1, jika 5 + 7 = 12 dan 7 + 5 = 12 maka 5 + 7 = 7 + 5 = 12, berlaku sifat komutatif. Nah, sekarang perhatikan soal nomor 2. Jika 5 – 7 = –2 dan 7 – 5 = 2, maka sifat komutatif tidak berlaku pada operasi pengurangan.
5
Multiple Choice
4 + (3+2) + 7 = 16
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BILANGAN BULAT
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