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Express each of the following rational numbers in the form of (a)/(b) where a and b are integers and b != 0.

Mathematics

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1. Express each of the following rational numbers in the form of ab\frac{a}{b} where aa and bb are integers and b≠0b \neq 0.

j) 0.123‾0.1\overline{23}

Step 1: Let xx be the repeating decimal.

x=0.1232323...x = 0.1232323...

Step 2: Multiply by 10 to shift the decimal just before the repeating block.

10x=1.232323...10x = 1.232323...

Step 3: Multiply by 1000 to shift the decimal past one repeating block and the non-repeating digit.

1000x=123.232323...1000x = 123.232323...

Step 4: Subtract the equation from Step 2 from the equation in Step 3.

1000x−10x=123.232323...−1.232323...1000x - 10x = 123.232323... - 1.232323... 990x=122990x = 122

Step 5: Solve for xx and simplify the fraction.

x=122990=122÷2990÷2=61495x = \frac{122}{990} = \frac{122 \div 2}{990 \div 2} = \frac{61}{495} 61495\boxed{\frac{61}{495}}

2. List twelve rational numbers which lie between:

Part a· 2 steps

1 and 0

  1. Express 0 and 1 as fractions with a common denominator greater than 12.

    We can use 13.

    0=0130 = \frac{0}{13} 1=13131 = \frac{13}{13}
  2. List twelve fractions between 013\frac{0}{13} and 1313\frac{13}{13}.

    113,213,313,413,513,613,713,813,913,1013,1113,1213\boxed{\frac{1}{13}, \frac{2}{13}, \frac{3}{13}, \frac{4}{13}, \frac{5}{13}, \frac{6}{13}, \frac{7}{13}, \frac{8}{13}, \frac{9}{13}, \frac{10}{13}, \frac{11}{13}, \frac{12}{13}}

Part b· 2 steps

4 and 5

  1. Express 4 and 5 as fractions with a common denominator greater than 12.

    We can use 13.

    4=4×1313=52134 = \frac{4 \times 13}{13} = \frac{52}{13} 5=5×1313=65135 = \frac{5 \times 13}{13} = \frac{65}{13}
  2. List twelve fractions between 5213\frac{52}{13} and 6513\frac{65}{13}.

    5313,5413,5513,5613,5713,5813,5913,6013,6113,6213,6313,6413\boxed{\frac{53}{13}, \frac{54}{13}, \frac{55}{13}, \frac{56}{13}, \frac{57}{13}, \frac{58}{13}, \frac{59}{13}, \frac{60}{13}, \frac{61}{13}, \frac{62}{13}, \frac{63}{13}, \frac{64}{13}}

Part c· 2 steps

−3-3 and −4-4

  1. Express −3-3 and −4-4 as fractions with a common denominator greater than 12.

    We can use 13.

    −4=−4×1313=−5213-4 = -\frac{4 \times 13}{13} = -\frac{52}{13} −3=−3×1313=−3913-3 = -\frac{3 \times 13}{13} = -\frac{39}{13}
  2. List twelve fractions between −5213-\frac{52}{13} and −3913-\frac{39}{13}.

    Remember that for negative numbers, a smaller absolute value means a larger number.

    −5113,−5013,−4913,−4813,−4713,−4613,−4513,−4413,−4313,−4213,−4113,−4013\boxed{-\frac{51}{13}, -\frac{50}{13}, -\frac{49}{13}, -\frac{48}{13}, -\frac{47}{13}, -\frac{46}{13}, -\frac{45}{13}, -\frac{44}{13}, -\frac{43}{13}, -\frac{42}{13}, -\frac{41}{13}, -\frac{40}{13}}
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