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Worksheet on Rational Number as Decimal Numbers

Practice the questions given in the worksheet on rational number as decimal numbers.

A fraction ab (in its lowest terms) is a terminating decimal only when its denominator that is b can be expressed as n = 2^m5^n where m, n = 0, 1, 2, ....

A fraction ab (in its lowest terms) is a recurring decimal only when its denominator that is b has a prime factor other than 2 or 5.

1. Which of the following will changes into a terminating decimal? Justify.

13125, 29, 2360, 7250

2. Write the following fractions as decimal number:

(i) 14

(ii) 1740

(iii) 119

(iv) 1344

(v) 47

3. Which of the following will be converted into a nonterminating decimal? Justify.

35, -975, 720, 430

4. Express 548 as a decimal fraction correct to four decimal places.

5. Which of the following will change into a recurring decimal? Justify.

34, 7150, -11200, 544

6. Without actual division, find which of the following fractions are terminating decimals:

(i) 716

(ii) 2180

(iii) 136250

(iv) 56

(v) 5460

(vi) 4855

(iii) 4463

(iv) 115640

7. If 314 is changed into a decimal number, what type of a decimal number will it be?

 

Answers for the worksheet on rational number as decimal numbers are given below.

 

Answers:

 

1. 13125, 7250

2. (i) 0.25

(ii) 0.425

(iii) 2.˙2

(iv) 0.29˙5˙4

(v) 0.¯538461

 

3. -975, 430

4. 0.1042

5. 7150, 544

6. (i) 716

(ii) 2180

(iii) 136250

(v) 5460

(iv) 115640

7. Nonterminating, recurring




9th Grade Math

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