Provide practice in the use and selection of strategies. Encourage students to develop efficient strategies. Examples of strategies for developing the addition and subtraction facts include:
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In problem solving, emphasis should be placed on thinking and reasoning rather than on key words. Focusing on key words such as in all, altogether, difference, etc., encourages students to perform a particular operation rather than make sense of the context of the problem. A key-word focus prepares students to solve a limited set of problems and often leads to incorrect solutions as well as challenges in upcoming grades and courses.
The least number of steps necessary to solve a single-step problem is one.
find the difference, using various methods of calculation.
Create and solve single-step and multistep practical problems involving the sum or difference of two whole numbers, each 9,999 or less. (b)
Understand that subtraction is used in practical situations when exact answers are needed.