You know that  Can you predict what the decimal expansions o

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 Multiple Choice QuestionsShort Answer Type

31. Write the following in decimal form and say what kind of decimal expansion each has: 

3 over 13
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32. Write the following in decimal form and say what kind of decimal expansion each has:

2 over 11
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33. Write the following in decimal form and say what kind of decimal expansion each has:

329 over 400
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34.  You know that 1 over 7 equals 0. top enclose 142857
 Can you predict what the decimal expansions of 

2 over 7 comma space 3 over 7 comma space 4 over 7 comma space 5 over 7 comma space 6 over 7
 are, without actually doing the long division? If so, how?



[Hint: Study the remainders while finding the value of 1 over 7 carefully.]


Yes! We can predict the decimal expansions of 2 over 7 comma space 3 over 7 comma space 4 over 7 comma space 5 over 7 comma space 6 over 7 without actually doing the long division as follows:

                                 downwards arrow

7 space right parenthesis space 1.0000000 space left parenthesis space 0.1428571.....
space space space space bottom enclose space 7 space space end enclose
space space space space space 30 space
space space space space bottom enclose space 28 space space end enclose
space space space space space space space 20 space space leftwards arrow
space space space space space space bottom enclose space 14 space space end enclose
space space space space space space space space 60
space space space space space space space bottom enclose space 56 space space end enclose
space space space space space space space space space 40
space space space space space space space space bottom enclose space 35 space space end enclose
space space space space space space space space space space 50
space space space space space space space space space bottom enclose space 49 space space end enclose space
space space space space space space space space space space space 10 space
space space space space space space space space space space bottom enclose space space 7 space space end enclose
space space space space space space space space space space space space 3 space

To predict the decimal expansion of 2 over 7 locate when the remainder becomes 2 and respective quotient (here it is 2). Then write the new quotient beginning from there using the repeating digits 1, 4, 2, 8, 5, 7.

therefore space space space space space 2 over 7 space equals space 0. top enclose 285714


Similarly,

           space space space space space space space space space space 3 over 7 equals space 0. top enclose 428571
space space space space space space space space space space 4 over 7 equals space 0. top enclose 571428
space space space space space space space space space space 5 over 7 equals space 0. top enclose 714285
a n d space space space space space 6 over 7 equals space 0. top enclose 857142

 
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35. Express the following in the form straight p over straight q where p and q are integers and q ≠ 0.
left parenthesis straight i right parenthesis space 0. top enclose 6

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36. Express the following in the form p over q where p and q are integers and q ≠ 0.

0. top enclose 47



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37. Express the following in the form straight p over straight q where p and q are integers and q ≠ 0.
0. top enclose 001
234 Views

38. Express 0.99999...... in the form straight p over straight q comma Are you surprised by your answer? With your teacher and classmates discuss why the answer makes sense.
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39. What can the maximum number of digits be in the repeating block of digits in the decimal expansion of 1 over 17 ? Perform the division to check your answer.
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40. Look at several examples of rational numbers in the form straight p over straight q left parenthesis q not equal to 0 right parenthesis commawhere p and q are integers with no common factors other than 1 and having terminating decimal representations (expansions). Can you guess what property q must satisfy?
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