Page 24 - Matematika SD-MI Kelas 5. Bab 1PART

7. 20 – 30 = … + ... = ....
8. 15 – 20 = …+ ... = ....
9. –9 – 17 = ... + ... = ....
10. –13 – (–10) = ... + ... = ....
11. 12 – 4 – 8 = …+ … + ... = ....
12. 7 – (–3) – 5 = ... + ... + ... = ....
13. –8 – 15 – (–6) = ... + ... + ... = ....
14. 20 – (–5) – (–25) = ... + ... + ... = ....
15. –25 – (–10) – (–20) = ... + ... + ... = ....

Aku pasti bisa 20

Ayo tentukan hasil operasi bilangan bulat. Salin di buku tugasmu.
1. –3 + 8 – 6 = .... 6. –6 + 15 – (–7) = ....
2. 10 - 12 + 15 = .... 7. 7 – (–9) + 10 = ....
3. –5 + (–4) + (–8) = .... 8. -9 + (–8) – 30 = ....
4. 15 – (–5) + 9 = .... 9. 12 + (–17) – (–2) = ....
5. –20 + (–8) – (–4) = .... 10. –12 – (–15) + (–10) = ….

3. Perkalian bilangan bulat

Perhatikan contoh berikut.

1. 3 × 4 = 12 4. –2 × (–8) = 16
2. 6 × (–5) = –30 5. –5 × (–9) = 45
3. –7 × 3 = –21

Dengan memperhatikan contoh di atas, kesimpulan apa yang kamu
temukan?
Perkalian dua bilangan yang bertanda sama menghasilkan bilangan
positif.
Jadi:
+ × + = +
– × – = +

24 Matematika V/1