Question

Ho van Quesuun.
1. Which of the following has a terminating decimal expansion?
(a) 32 (b) 19 (c) 23 (d) 25
91. 80. 45. 42​

Answer 1

Step-by-step explanation:

(a) 32/91

91=13×7

(b)19/80

80=2×2×2×2×5

(c)23/45

45=3×3×5

(d)25/42

42=2×3×7

Since 80 has factors 2^4×5

So (b) 19/80 has a terminating decimal expansion