Rumus Perkalian Pecahan Desimal dan Pembahasan Soal

2/5 X 7/10 = 2×7 / 5×10 = 14/50 = 7/25

4. 3/4 x 2 3/10 =
= 3/4 x 23/10
= (3 x 23)/(4 x 10)
= 69/40
= 1 29/40

5. 4/5 x 1 7/8 =
= 4/5 x 15/8
= (4 x 15)/(5×8)
= 60/40 = 3/2
= 1 1/2

6. 5/8 x 1 3/4 =
= 5/8 x 7/4
= (5 x 7)/(8 x 4)
= 35/32
= 1 3/32

7. Hitunglah 1/3 x 1/7 = . . .?

Jawab : 1/3 x 1/7 = 1×1 / 3×7 =1/21

8. Hitung perkalian 3 pecahan ini 1/2 x 4/5 x 3/8 = . . .?

Jawab : Soal tersebut merupakan perkalian tiga pecahan berturut-turut.

1/2x 4/5 x 3/8 = 1x4x3 / 2x5x8 = 12/80 = 3/20

9. Hitung 8/9 x 3/4 = …?

Jawab: 8/9 x 3/4 = (8 x 3) / (9 x 4) = 24/36 = 2/3

10. 1 2/7 x 2/3 =
= 9/7 x 2/3
= (9 x 2)/(7 x 3)
= 18/21 = 6/7