Napier, a Scotsman invented a way to create a manual computer for Multiplication. Even 1st graders can create and grow vastly the concept of Multiplication and successive addition - Here's how to create the least expensive calculator:
1. Go to any store that sells paint. Fast talk the salesman to give you a dozen paint paddles for a good cause.
2. Have your student lay one of the paddles across the bottom of another paddle at a "right Angle - this creates a square when you draw a line across the top.
3. continue this until you are at the curve near the handle - this should be the ninth square,
4. Draw diagonals from the lower left to the upper right - to the lower right will be the single digit numerals, and to the upper left will be the "carry" when needed.
5. the 1st handle will be X1 shown on the handle. In the top square will be "1" in the 1st digit area below the diagonal - there is no "carry" so the upper left will be blank. (This will be true for all nine numerals).
6. Count to add the next numeral in the square below - 1,2,3,4,5,6,7,8 & 9. this completes the X1 Rod.
7. The 2nd Rod will have the title X2. This rod will have the single digits from top to bottom: 2,4, 6, 8, 0, 2, 4, 6, 8 & 0 in the one's digits.
8. At 8 and 2 more, there is a carry to the upper left of 0. ( the ones will continue 0n to the single digit 8 which will be opposite 9 on the x1 paddle. (9 x 2 = 18, 1 in the upper left and 8 at the lower right which is read as 10 + 8 = 18.
9. the next paddle has the title of X3 and has the single digits of: 3, 6, 9, 2, 5, 8, 1, 4, & 7. This will be the real challenge for a 3rd grader when placed to the right of the X1 paddle. (9 x 3 = 27, 2in the upper left became "1" at 9 & 3 more and became "2" at 18 & 3 more - 3 x 6 = 18; 3 x 9 = 27.
10. The times five paddle is unique due to 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5. (5 x 9 = 45).
11. watch for more Napier's rods at "the Second Five"
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Understanding How to Create Napier's Rods
Re: Understanding how to Create Napier's Rods
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