For numbers between 10 and 20 , describe how to develop each of these ideas: a. The idea of the

step 1 All right, welcome back. For this problem, we have 10, and we want to stick four arithmetic mean

For numbers between 10 and 20 , describe how to develop each...

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Key Concepts

One-More/One-Less Concept

The one-more/one-less concept is a counting strategy that builds number sense by recognizing that adding or subtracting one from a number yields a neighboring number. Extending this idea to the teens helps students understand the sequential nature of numbers, as they can see that 11 is one more than 10 and 13 is one less than 14, reinforcing their ability to navigate and compare numbers within the group's framework.

Place Value

Place value is the principle that the position of a digit in a number determines its value. In the context of numbers between 10 and 20, understanding that they are composed of a 'ten' and extra units helps students see why 11 is 10 plus 1, 12 is 10 plus 2, and so on, reinforcing the structure of our base-ten number system.

Number Decomposition

Number decomposition involves breaking a number into meaningful parts, such as tens and ones. For numbers in the teens, this means representing them as a combination of 10 and an additional number, which aids in grasping the concept of counting beyond a complete set of ten and facilitates easier computation and mental math.

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