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2. Number line - Wikipedia

   en.wikipedia.org/wiki/Number_line

   The first mention of the number line used for operation purposes is found in John Wallis's Treatise of algebra (1685). [2] In his treatise, Wallis describes addition and subtraction on a number line in terms of moving forward and backward, under the metaphor of a person walking.

3. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   Example of addition with carry. The black numbers are the addends, the green number is the carry, and the blue number is the sum. In the rightmost digit, the addition of 9 and 7 is 16, carrying 1 into the next pair of the digit to the left, making its addition 1 + 5 + 2 = 8. Therefore, 59 + 27 = 86.

4. File:Number line with addition of 1 and 2.svg - Wikipedia

   en.wikipedia.org/wiki/File:Number_line_with...

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5. Number bond - Wikipedia

   en.wikipedia.org/wiki/Number_bond

   For example, a number bond looks like + = A child who "knows" this number bond should be able to immediately fill in any one of these three numbers if it were missing, given the other two, without having to "work it out". Number bonds are often learned in sets for which the sum is a common round number such as 10 or 20. Having acquired some ...

6. Addition - Wikipedia

   en.wikipedia.org/wiki/Addition

   A number-line visualization of the algebraic addition 2 + 4 = 6. A "jump" that has a distance of 2 followed by another that is long as 4, is the same as a translation by 6. A number-line visualization of the unary addition 2 + 4 = 6. A translation by 4 is equivalent to four translations by 1.

7. California to remove racist term for Native American Woman ...

   www.aol.com/california-remove-racist-term-native...

   Officials in California are working to remove a racist term towards Native American women in more than 30 locations in California, according to the state Natural Resources Agency.. The removal of ...