First Grade Common Core Math Task Cards 1 OA.4 Subtraction As An Unknown-Addend Problem 1.OA.4 Practice provides two ways for students to practice and show mastery of their ability to understand subtraction as an unknown-addend problem.
Includes 40 unique Task Cards with 20 being multiple choice and 20 fill-in the blank!
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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Standard 1.OA.4 Understand and apply properties of operations and the relationship between addition and subtraction.
4. Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.