Sifat distributif

Distributif artinya penyebaran. Sifat distributif dibedakan menjadi dua, yaitu:
a. Sifat distributif perkalian terhadap penjumlahan
a × (b + c) = (a × b) + (a × c)
b. Sifat distributif perkalian terhadap pengurangan
a × (b – c) = (a × b) – (a × c)

a. Sifat distributif perkalian terhadap penjumlahan
Perhatikan contoh

Ayo kerjakan soal-soal berikut ini. Salin di buku tugasmu.
1. 9 × (10 + 5) = (9 × 10) + (9 × ....)
2. 15 × (12 + 8) = (15 ×12 ) + (15 x ….)
3. 30 × (15 + 25) = (30 × ...) + (30 x 25)
4. 45 × (20 + 10) = (45 × ...) + (45 x 10)
5. 50 × (15 + 30) = (50 × .. ) + (50 × 30)
6. 12 × (9 + 15) = (12 × 9) + (12 × 15)
7. 25 × (14 + 15) = (25 × 14) + (25 × ....)
8. (7 × 18) × 10 = (.... × 10) + (18 × 10)
9. (35 × 75) × 20 = (35 × 20) + (.... × 20)
10. (... × 25) × 30 = (10 × 30) + (25 × 30)

b. Sifat distributif perkalian terhadap pengurangan

Ayo kerjakan soal-soal di bawah ini dengan benar. Salin di buku tugasmu.
1. 8 × (20 – 12) = (8 × 20) – (8 × ...) = ....
2. 12 × (25 – 15) = (12 × 25) – (12 × ...) = ....
3. 20 × (10 – 7) = (20 × ...) – (20 × 7) = ....
4. 10 × (28 – 8) = (10 × ...) – (10 × 8) = ....
5. 25 × (17 – 7) = (25 × ...) – (25 × 7) = ....
6. (30 – 10 ) × 5 = (... × 5) – (10 × 5) = ....
7. (40 – 25 ) × 15 = (... × 15) – (25 × 15) = ....
8. (35 – 5 ) × 4 = (35 × 4) – (... × 4) = ....
9. (96 – 19 ) × 9 = (96 × 9) – (... × 9) = ....
10. (45 – 35 ) × 13 = (45 × 13) – (... × 13) = ....
11. (20 – ...) × 11 = ( 20 × 11) – (8 × 11) = ....
12. (25 – ...) × 7 = ( 25 × 7) – (15 × 7) = ....
13. (... – 4 ) × 6 = ( 15 × 6) – (4 × 6) = ....
14. (... – 10 ) × 12 = ( 25 × 12) – (10 × 12) = ....
15. 30 × (100 – ...) = ( 30 × 100) – (30 × 25) = ....