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1. Tentukan KPK dari angka-angka berikut ini :a. 10 dan 15
b. 9 dan 36
c. 8 dan 25
d. 12, 15 dan 18
e. 4, 15 dan 20
Tentukan FPB dari angka-angka berikut ini :
a. 15 dan 25
b. 20 dan 100
c. 36 dan 45
d. 50, 60 dan 75
e. 40, 64 dan 100
jawaban:
1.a. 10 dan 15
10 = 2 x 5
15 = 3 x 5
KPK = 2 x 3 x 5 = 30
b. 9 dan 36
9 = 3 x 3
36 = 2 x 2 x 3 x 3
KPK = 2 x 2 x 3 x 3 = 36
c. 8 dan 25
8 = 2 x 2 x 2
25 = 5 x 5
KPK = 2 x 2 x 2 x 5 x 5 = 200
d. 12, 15 dan 18
12 = 2 x 2 x 3
15 = 3 x 5
18 = 2 x 3 x 3
KPK = 2 x 2 x 3 x 3 x 5 = 180
e. 4, 15 dan 20
4 = 2 x 2
15 = 3 x 5
20 = 2 x 2 x 5
KPK = 2 x 2 x 3 x 5 = 60.
2. a. 15 dan 25
15 = 3 x 5
25 = 5 x 5
FPB = 5
b. 20 dan 100
20 = 2 x 2 x 5
100 = 2 x 2 x 5 x 5
FPB = 2 x 2 x 5 = 20
c. 36 dan 45
36 = 2 x 2 x 3 x 3
45 = 3 x 3 x 5
FPB = 3 x 3 = 9
d. 50, 60 dan 75
50 = 2 x 5 x 5
60 = 2 x 2 x 3 x 5
75 = 3 x 5 x 5
FPB = 5
e. 40, 64 dan 100
40 = 2 x 2 x 2 x 5
64 = 2 x 2 x 2 x 2 x 2 x 2
100 = 2 x 2 x 5 x 5
FPB = 2 x 2 = 4
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