Math Games

Primary 2 - Number and Algebra: Whole Numbers

Standard 2.NA-WN.2 - Complete the subtraction sentence by filling in the missing number with operands up to 1000.

Included Skills:

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.