2. Without actual division, determine which of the following rational numbers have a
terminating decimal representation and which have a non-terminating decimal
representation.
11/ 4
Explain the formula . 2^n , 5^m
Answers
Answer:
the formula 2 and 5 m 60 word /op 9
Step-by-step explanation:
We know that qp is terminating if p and q are co-prime and q is of the form 2m5n; where m and n are non-negative integers.
(A) 253:
Checking co-prime-
Since 3 and 25 have no common factors, hence 3 and 25 are co-prime.
Now,
25=5×5=52
∴ Denominator=52=1×52=20×52
∴ Denominator is of the form 2m5n, where m = 0 and n = 2.
Hence, 253 is a terminating decimal.
(B) 1811:
Checking co-prime-
Since 11 and 18 have no common factors, hence 11 and 18 are co-prime.
Now,
18=2×3×3=2×32
∴ Denominator is not of the form 2m5n.
Hence, 1811 is not a terminating decimal.
(C) 2013:
Checking co-prime-
Since 13 and 20 have no common factors, hence 13 and 20 are co-prime.
Now,
20=2×2×5=22×5
∴ Denominator=22×5=22×51
∴ Denominator is of the form 2m5n, where m = 2 and n = 1.
Hence, 20
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