Provide practice in the use and selection of strategies. Encourage students to develop efficient strategies.
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Recall and state orally the basic addition facts for sums with two addends to 18 or less and the corresponding subtraction facts.
Addition is the combining of quantities; it uses the following terms: addend --> 423 + addend -->246= 669 --> sum.
Students should have exposure to a variety of problem types related to addition and subtraction. Examples are represented in the chart below. It is important to note that Join Problems (with start unknown), Separate Problems (with start unknown), Compare Problems (with larger unknown – using “fewer”) and Compare problems (with smaller unknown – using “more”) are the most difficult and should be mastered in grade two. [Graphic cannot be reproduced.]
Manipulatives should be used to develop an understanding of addition and subtraction facts.
Apply strategies, including place value and the properties of addition, to subtract two whole numbers, each 9,999 or less. (a, b)