2 NBT.9 Addition & Subtraction Strategy Word Problems - Second Grade Common Core Math Task Cards - 2.NBT.9 Practice provides two ways for students to practice addition and subtraction strategies.
Includes 40 unique Task Cards!
Includes both a student answer sheet as well as matching layout (easier to grade) answer key! Cards are numbered so that answers on student sheet will be in proper order. Cards are 4 to a page and can be printed in both color or gray-scale (I tried both!) Don't forget to laminate so they will last for years!
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Use place value understanding and properties of operations to add
9. Explain why addition and subtraction strategies work, using place value and the properties of operations