Hendersons Intellectual And Practical Lightning Calculator
Hendersons Intellectual And Practical Lightning Calculator
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In our eReader you can find the full English version of the book. Read Hendersons Intellectual And Practical Lightning Calculator Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Hendersons Intellectual And Practical Lightning Calculator
What reading level is Hendersons Intellectual And Practical Lightning Calculator book?
To quickly assess the difficulty of the text, read a short excerpt:
, down to 1.
PROBLEM 25. Take 8 T \, multiply by 8j|, etc. , down to 1.
PROBLEM 26. Take 13|, multiply by 13^; etc. , down to 1.
64 HENDERSON'S V The mean of two numbers, is half their sum, or the number equally distant from the two numbers.
The product of two numbers is the square of their mean diminished by the square of half of their dif- ference.
PROBLEM 27. 19 times 21, 18 times 22, etc. , down to 15. Tims : The mean is 20, the square of 20 is 400, 400 the square of 1 is 399 ; the product,... 18 times 22 is the square of 20, 400 the square of 2, 4, 396. 17 times 23 is 391, 16 times 24, 384 ; 15 times 25, 375.
PROBLEM 28. Take 29 by 31, 28 by 32, etc. , down to 20 and up to 40.
PROBLEM 29. Take 39 by 41, 38 by 42, etc. , down to 30 and up to 50.
PROBLEM 30. Take 49 by 51, 48 by 52, etc. , down to 40 and up to 60.
PROBLEM 31. Take 59 by 61, 58 by 62, etc. , dowm to 50 and up to 70.
PROBLEM 32. Take 69 by 71, 68 by 72, etc. , down to 60 and up to 80.
PROBLEM 33. Take 79 by 81, 78 by 82, etc.
What to read after Hendersons Intellectual And Practical Lightning Calculator?
You can find similar books in the "Read Also" column, or choose other free books by John Henderson Alexander to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
, down to 1.
PROBLEM 25. Take 8 T \, multiply by 8j|, etc. , down to 1.
PROBLEM 26. Take 13|, multiply by 13^; etc. , down to 1.
64 HENDERSON'S V The mean of two numbers, is half their sum, or the number equally distant from the two numbers.
The product of two numbers is the square of their mean diminished by the square of half of their dif- ference.
PROBLEM 27. 19 times 21, 18 times 22, etc. , down to 15. Tims : The mean is 20, the square of 20 is 400, 400 the square of 1 is 399 ; the product,... 18 times 22 is the square of 20, 400 the square of 2, 4, 396. 17 times 23 is 391, 16 times 24, 384 ; 15 times 25, 375.
PROBLEM 28. Take 29 by 31, 28 by 32, etc. , down to 20 and up to 40.
PROBLEM 29. Take 39 by 41, 38 by 42, etc. , down to 30 and up to 50.
PROBLEM 30. Take 49 by 51, 48 by 52, etc. , down to 40 and up to 60.
PROBLEM 31. Take 59 by 61, 58 by 62, etc. , dowm to 50 and up to 70.
PROBLEM 32. Take 69 by 71, 68 by 72, etc. , down to 60 and up to 80.
PROBLEM 33. Take 79 by 81, 78 by 82, etc.
What to read after Hendersons Intellectual And Practical Lightning Calculator?
You can find similar books in the "Read Also" column, or choose other free books by John Henderson Alexander to read onlineMoreLess
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