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Primary 2 - Number and Algebra: Whole Numbers
Standard 2.NA-WN.2 - Practice solving subtraction sentences with one and two digit numbers.
Addition and Subtraction • 2.1 addition and subtraction algorithms (up to 3 digits) • 2.2 solving up to 2-step word problems involving addition and subtraction • 2.3 mental calculation involving addition and subtraction of a 3-digit number and ones/tens/hundreds • 2.4 write addition and subtraction equations for number stories and explain the meaning of the equal sign. • 2.5 achieve mastery of basic addition and subtraction facts within 20 by - writing a family of 4 basic facts within 20 given any one of the basic facts (e.g. 9 + 7 = 16, 7 + 9 = 16, 16 – 9 = 7 and 16 – 7 = 9 are a family of addition and subtraction facts). - playing games, including applets and digital games. • 2.6 work in groups using the base-ten set/play money to illustrate the standard algorithms for addition and subtraction up to 3 digits. • 2.7 use the part-whole and comparison models to illustrate the concepts of addition and subtraction and use the models to determine which operation (addition or subtraction) to use when solving 1-step word problems. • 2.8 use the comparison model to reinforce the language of comparison such as "Ali has 30 more stickers than Siti." • 2.9 solve 2-part word problems (1 step for each part) before solving 2-step word problems. • 2.10 achieve mastery of addition and subtraction algorithms up to 3 digits by playing games, including applets and digital games. • 2.11 work in groups to create word problems involving addition and subtraction for other groups to solve.