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#### Question

The following real numbers have decimal expansions as given below. In each case, decide whether they are rational or not. If they are rational, and of the form p /q what can you say about the prime factors of q?

(1) 43.123456789

(2) 0.120120012000120000. . .

(3) `43.bar(123456789)`

#### Solution

#### Similar questions

Write down the decimal expansions of those rational numbers which have terminating decimal expansions.

(a) `13/3125`

(b) `17/8`

(c)`15/1600`

(d)`23/(2^2`

(e)`6/15`

(f)`35/50`

Without actually performing the long division, state whether the following rational numbers will have a terminating decimal expansion or a non-terminating repeating decimal expansion:

(i)`13/3125`

(ii) `17/8`

(iii) `64/455`

(iv) `15/1600`

(v) `29/343`

(vi) `23/(2^3`

(vii) `129/(2^2`

(viii) `6/15`

(ix) `35/50`

(x) `77/210`