Math worksheet for converting repeating decimals to fractions.
Worksheet titled "Rational and Irrational Numbers" with 16 problems asking to express non-terminating recurring decimals as fractions in the form p/q.
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Step-by-step solution for: Irrational Numbers Worksheets - 15 Worksheets Library
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Show Answer Key & Explanations
Step-by-step solution for: Irrational Numbers Worksheets - 15 Worksheets Library
Here are the solutions for converting the recurring decimals into fractions.
To solve these, we use a standard method:
1. Let $x$ equal the recurring decimal.
2. Multiply $x$ by a power of 10 (like 10, 100, 1000) to move the decimal point so that the repeating part lines up.
3. Subtract the original equation from the new one to remove the repeating decimals.
4. Solve for $x$ and simplify the fraction.
1) $0.\overline{3}$
Let $x = 0.333...$
Multiply by 10: $10x = 3.333...$
Subtract $x$: $9x = 3$
$x = \frac{3}{9} = \frac{1}{3}$
2) $1.\overline{4}$
Let $x = 1.444...$
Multiply by 10: $10x = 14.444...$
Subtract $x$: $9x = 13$
$x = \frac{13}{9}$ (or $1 \frac{4}{9}$)
3) $0.\overline{57}$
Let $x = 0.5757...$
Multiply by 100 (since 2 digits repeat): $100x = 57.5757...$
Subtract $x$: $99x = 57$
$x = \frac{57}{99}$
Divide top and bottom by 3: $\frac{19}{33}$
4) $0.\overline{001}$
Let $x = 0.001001...$
Multiply by 1000 (since 3 digits repeat): $1000x = 1.001001...$
Subtract $x$: $999x = 1$
$x = \frac{1}{999}$
5) $0.\overline{53}$
Let $x = 0.5353...$
Multiply by 100: $100x = 53.5353...$
Subtract $x$: $99x = 53$
$x = \frac{53}{99}$
6) $2.\overline{93}$
Let $x = 2.9393...$
Multiply by 100: $100x = 293.9393...$
Subtract $x$: $99x = 291$
$x = \frac{291}{99}$
Divide top and bottom by 3: $\frac{97}{33}$ (or $2 \frac{31}{33}$)
7) $18.\overline{48}$
Let $x = 18.4848...$
Multiply by 100: $100x = 1848.4848...$
Subtract $x$: $99x = 1830$
$x = \frac{1830}{99}$
Divide top and bottom by 3: $\frac{610}{33}$ (or $18 \frac{16}{33}$)
8) $0.2\overline{35}$
This one is tricky because the '2' doesn't repeat, only '35' does.
Let $x = 0.23535...$
Multiply by 10 to move the non-repeating part: $10x = 2.3535...$
Multiply by 1000 to move one full cycle of the repeat: $1000x = 235.3535...$
Subtract the first from the second: $990x = 233$
$x = \frac{233}{990}$
9) $0.00\overline{32}$
Let $x = 0.003232...$
Multiply by 100 to pass the non-repeating zeros: $100x = 0.3232...$
Multiply by 10000 to pass the repeating part: $10000x = 32.3232...$
Subtract: $9900x = 32$
$x = \frac{32}{9900}$
Divide by 4: $\frac{8}{2475}$
10) $0.\overline{9}$
Let $x = 0.999...$
Multiply by 10: $10x = 9.999...$
Subtract $x$: $9x = 9$
$x = \frac{9}{9} = 1$
11) $2.4\overline{178}$
Let $x = 2.4178178...$
Multiply by 10: $10x = 24.178178...$
Multiply by 10000: $10000x = 24178.178178...$
Subtract: $9990x = 24154$
$x = \frac{24154}{9990}$
Divide by 2: $\frac{12077}{4995}$ (or $2 \frac{2087}{4995}$)
12) $2.\overline{36}$
Let $x = 2.3636...$
Multiply by 100: $100x = 236.3636...$
Subtract $x$: $99x = 234$
$x = \frac{234}{99}$
Divide by 9: $\frac{26}{11}$ (or $2 \frac{4}{11}$)
13) $1.\overline{323}$
Let $x = 1.323323...$
Multiply by 1000: $1000x = 1323.323...$
Subtract $x$: $999x = 1322$
$x = \frac{1322}{999}$ (or $1 \frac{323}{999}$)
14) $0.3\overline{178}$
Let $x = 0.3178178...$
Multiply by 10: $10x = 3.178178...$
Multiply by 10000: $10000x = 3178.178178...$
Subtract: $9990x = 3175$
Divide by 5: $x = \frac{635}{1998}$
15) $0.4\overline{07}$
Let $x = 0.40707...$
Multiply by 10: $10x = 4.0707...$
Multiply by 1000: $1000x = 407.0707...$
Subtract: $990x = 403$
$x = \frac{403}{990}$
16) $32.12\overline{35}$
Let $x = 32.123535...$
Multiply by 100: $100x = 3212.3535...$
Multiply by 10000: $10000x = 321235.3535...$
Subtract: $9900x = 318023$
$x = \frac{318023}{9900}$ (or $32 \frac{1223}{9900}$)
Final Answer:
1) $\frac{1}{3}$
2) $\frac{13}{9}$
3) $\frac{19}{33}$
4) $\frac{1}{999}$
5) $\frac{53}{99}$
6) $\frac{97}{33}$
7) $\frac{610}{33}$
8) $\frac{233}{990}$
9) $\frac{8}{2475}$
10) $1$
11) $\frac{12077}{4995}$
12) $\frac{26}{11}$
13) $\frac{1322}{999}$
14) $\frac{635}{1998}$
15) $\frac{403}{990}$
16) $\frac{318023}{9900}$
To solve these, we use a standard method:
1. Let $x$ equal the recurring decimal.
2. Multiply $x$ by a power of 10 (like 10, 100, 1000) to move the decimal point so that the repeating part lines up.
3. Subtract the original equation from the new one to remove the repeating decimals.
4. Solve for $x$ and simplify the fraction.
1) $0.\overline{3}$
Let $x = 0.333...$
Multiply by 10: $10x = 3.333...$
Subtract $x$: $9x = 3$
$x = \frac{3}{9} = \frac{1}{3}$
2) $1.\overline{4}$
Let $x = 1.444...$
Multiply by 10: $10x = 14.444...$
Subtract $x$: $9x = 13$
$x = \frac{13}{9}$ (or $1 \frac{4}{9}$)
3) $0.\overline{57}$
Let $x = 0.5757...$
Multiply by 100 (since 2 digits repeat): $100x = 57.5757...$
Subtract $x$: $99x = 57$
$x = \frac{57}{99}$
Divide top and bottom by 3: $\frac{19}{33}$
4) $0.\overline{001}$
Let $x = 0.001001...$
Multiply by 1000 (since 3 digits repeat): $1000x = 1.001001...$
Subtract $x$: $999x = 1$
$x = \frac{1}{999}$
5) $0.\overline{53}$
Let $x = 0.5353...$
Multiply by 100: $100x = 53.5353...$
Subtract $x$: $99x = 53$
$x = \frac{53}{99}$
6) $2.\overline{93}$
Let $x = 2.9393...$
Multiply by 100: $100x = 293.9393...$
Subtract $x$: $99x = 291$
$x = \frac{291}{99}$
Divide top and bottom by 3: $\frac{97}{33}$ (or $2 \frac{31}{33}$)
7) $18.\overline{48}$
Let $x = 18.4848...$
Multiply by 100: $100x = 1848.4848...$
Subtract $x$: $99x = 1830$
$x = \frac{1830}{99}$
Divide top and bottom by 3: $\frac{610}{33}$ (or $18 \frac{16}{33}$)
8) $0.2\overline{35}$
This one is tricky because the '2' doesn't repeat, only '35' does.
Let $x = 0.23535...$
Multiply by 10 to move the non-repeating part: $10x = 2.3535...$
Multiply by 1000 to move one full cycle of the repeat: $1000x = 235.3535...$
Subtract the first from the second: $990x = 233$
$x = \frac{233}{990}$
9) $0.00\overline{32}$
Let $x = 0.003232...$
Multiply by 100 to pass the non-repeating zeros: $100x = 0.3232...$
Multiply by 10000 to pass the repeating part: $10000x = 32.3232...$
Subtract: $9900x = 32$
$x = \frac{32}{9900}$
Divide by 4: $\frac{8}{2475}$
10) $0.\overline{9}$
Let $x = 0.999...$
Multiply by 10: $10x = 9.999...$
Subtract $x$: $9x = 9$
$x = \frac{9}{9} = 1$
11) $2.4\overline{178}$
Let $x = 2.4178178...$
Multiply by 10: $10x = 24.178178...$
Multiply by 10000: $10000x = 24178.178178...$
Subtract: $9990x = 24154$
$x = \frac{24154}{9990}$
Divide by 2: $\frac{12077}{4995}$ (or $2 \frac{2087}{4995}$)
12) $2.\overline{36}$
Let $x = 2.3636...$
Multiply by 100: $100x = 236.3636...$
Subtract $x$: $99x = 234$
$x = \frac{234}{99}$
Divide by 9: $\frac{26}{11}$ (or $2 \frac{4}{11}$)
13) $1.\overline{323}$
Let $x = 1.323323...$
Multiply by 1000: $1000x = 1323.323...$
Subtract $x$: $999x = 1322$
$x = \frac{1322}{999}$ (or $1 \frac{323}{999}$)
14) $0.3\overline{178}$
Let $x = 0.3178178...$
Multiply by 10: $10x = 3.178178...$
Multiply by 10000: $10000x = 3178.178178...$
Subtract: $9990x = 3175$
Divide by 5: $x = \frac{635}{1998}$
15) $0.4\overline{07}$
Let $x = 0.40707...$
Multiply by 10: $10x = 4.0707...$
Multiply by 1000: $1000x = 407.0707...$
Subtract: $990x = 403$
$x = \frac{403}{990}$
16) $32.12\overline{35}$
Let $x = 32.123535...$
Multiply by 100: $100x = 3212.3535...$
Multiply by 10000: $10000x = 321235.3535...$
Subtract: $9900x = 318023$
$x = \frac{318023}{9900}$ (or $32 \frac{1223}{9900}$)
Final Answer:
1) $\frac{1}{3}$
2) $\frac{13}{9}$
3) $\frac{19}{33}$
4) $\frac{1}{999}$
5) $\frac{53}{99}$
6) $\frac{97}{33}$
7) $\frac{610}{33}$
8) $\frac{233}{990}$
9) $\frac{8}{2475}$
10) $1$
11) $\frac{12077}{4995}$
12) $\frac{26}{11}$
13) $\frac{1322}{999}$
14) $\frac{635}{1998}$
15) $\frac{403}{990}$
16) $\frac{318023}{9900}$
Parent Tip: Review the logic above to help your child master the concept of rational vs irrational numbers worksheet.