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15) 14 = 2 × 7
21 = 3 × 7
42 = 2 × 3 × 7
kpk = 2 × 3 × 7 = 42

16) 2⁴ × 3 × 5 = 16 × 15 = 240

17) 72 = 2³ × 3²
189 = 3³ × 7
kpk = 2³ × 3³ × 7

18)72 = 2³ × 3²
96 = 2^5 × 3
FPB = 2³ × 3

19)42 = 2 × 3 × 7
63 = 3² × 7
84 = 2² × 3 × 7
FPB = 3 × 7 = 21

15. Kpk dari 14 , 21 , dan 42
14 = 2 × 7
21 = 3 × 7
42 = 2 × 3 × 7
Kpk = 2 × 3 × 7 = 42
Jawabannya b. 42

16. 2⁴ × 3 = ( 2×2×2×2 ) × 3 = 16 × 3 = 48
2² × 3 × 5 = ( 2×2 ) × 3 × 5 = 4 × 3 × 5 = 60
Kpk = 2⁴ × 3 × 5 = ( 2×2×2×2 ) × 3 × 5 = 240
Jawabannya a. 240

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