CASIO

When inputting a recurrent decimal, press () before inputting its period (repetend) and then input the period up to the ending value. To input the recurring decimal 0.909090.... (0.90), perform the following operation: “0() 90”.

Example 1: To input 0.33333… (0.3)

• 0
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• ()
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• 3
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Example 2: To input 1.428571428571... (1.428571)

• 1()
• 

• 428571
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Example 3: To calculate 1.021 + 2.312

• 1() 021
  2() 312
• 

Calculation result displayed as recurring decimal value:

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Calculation results that can be displayed as recurring decimal values will be displayed as such when On is selected for the Recurring Dec setting on the setup menu.

Pressing the key will cycle between the available calculation result formats.

Example 1: ¹₇ = 0.142857 = 0.1428571429 (Number Format: Norm 1)

• 17
• 

Display as recurring decimal:

• 
• 

Decimal value according to Norm 1 setting:

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• 

Return to initial display format (fraction):

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• 

Example 2: 1 ÷ 7 = ¹₇ = 0.142857 = 0.1428571429 (Number Format: Norm 1)

• 17(≈)
• 

Display as fraction:

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• 

Display as recurring decimal:

• 
• 

Return to initial display format (Norm 1):

• 
• 

Example 3: ¹₇ = 0.142857 = 0.1428571429 (Norm 1)

(LineI/LineO)

• 17
• 

Display as recurring decimal:

• 
• 

Decimal value according to Norm 1 setting:

• 
• 

Return to initial display format (fraction):

• 
• 

Example 4: 1 ÷ 7 = 0.1428571429 (Norm 1) = 0.142857 = ¹₇

(LineI/LineO)

• 17
• 

Display as fraction:

• 
• 

Display as recurring decimal:

• 
• 

Return to initial display format (Norm 1):

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• 

If a calculation result satisfies the following conditions, pressing will display it as a recurring decimal value.

The total number of digits used in the mixed fraction (including integer, numerator, denominator, and separator symbol) must be no more than 10.

Example 1: 0.3 + 0.45 = 0.78

• 0() 3
  0() 45
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Example 2: 1.6 + 2.8 = 4.5

• 1() 6
  2() 8
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Example 3: To confirm the following: 0.123 = ¹²³₉₉₉, 0.1234 = ¹²³⁴₉₉₉₉, 0.12345 = ¹²³⁴⁵₉₉₉₉₉

• 123999
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• 12349999
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• 1234599999
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