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Magic with the calendar

Have a person mark any given calendar month in a 3-by-3 “square” containing 9 days. See an example of a calendar choice below for August 2005. August 2005 Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Then ask her to tell you the smallest date on the square, and say that with that date alone you will find out the sum of all the chosen dates.
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Your age and chocolate

Text submitted by user Eudes Antonio, relating the age of a person to their desire to eat chocolate. Click here to read (PDF file) When does a century begin? Index Next >> Mega Sena Odds
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Resolution of complete equations

To solve complete equations of the 2nd degree we will use the Bhaskara formula. From the equation, where a, b, c IR e, we will develop step by step the deduction of the Bhaskara formula (or solving formula). Step 1: We will multiply both members by 4 a. 2nd step: pass 4 ac to 2nd member.
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The number 12345679

If we multiply the number 12345679 by any multiple of 9, between 9 and 81, we get a product whose repeating digit is the multiplier itself divided by 9. 12345679 x 9 = 111.111.111 (9/9 = 1) 12345679 x 18 = 222,222,222 (18/9 = 2) 12345679 x 27 = 333,333,333 (27/9 = 3) 12345679 x 36 = 444.
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Decimal Number Exercises

Given the fraction, say which decimal number it represents: a) b) c) d) e) f) Given the decimal number, tell which fraction it corresponds to: a) 0.566 b) 0.13 c) 0.00098 d) 0.077
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