(8 + 6 = 8 + 2 + 4 = 10 + 4 = 14) decomposing a number leading to a ten (13 - 4 = 13 - 3 - 1 = 10 - 1 = 9) the relationship between addition and subtraction, such as fact families, (8 + 4 = 12 and 12 - 8 = 4) creating equivalent but easier or sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13). Work with addition and subtraction Work with equal groups of objects to gain equations. foundations for multiplication. 1.OA.7. Understand the meaning of the equal 2.OA.3. Determine whether a group of objects sign (e.g., read equal sign as as”) and (up to 20) is odd or even (e.g., by pairing “same determine if equations involving addition and objects and comparing, counting by 2s). subtraction are true or false. Model an even number as two equal groups of For example, objects and then write an equation as a sum of which of the following equations are true and two equal addends. which are false?6 = 6, 7 = 8 - 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2). 2.OA.4. Use addition to find the total number 1.OA.8. Determine the unknown whole of objects arranged in rectangular arrays with number in an addition or subtraction equation. up to 5 rows and up to 5 columns. Write an equation to express the total as repeated For example, determine the unknown number addition (e.g., array of 4 by 5 would be that makes the equation true in each of the 5 + 5 + 5 + 5 = 20). equations 8 + ? = 11, 6 + 6 = ?, 5 = ? - 3. Grade K Grade 1 Grade 2
(8 + 6 = 8 + 2 + 4 = 10 + 4 = 14) decomposing a number leading to a ten (13 - 4 = 13 - 3 - 1 = 10 - 1 = 9) the relationship between addition and subtraction, such as fact families, (8 + 4 = 12 and 12 - 8 = 4) creating equivalent but easier or sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13). Work with addition and subtraction equations. Work with equal groups of objects to gain foundations for multiplication. 1.OA.7. Understand the meaning of the equal sign (e.g., read equal sign as “same as”) and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false?6 = 6, 7 = 8 - 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2). 1.OA.8. Determine the unknown whole number in an addition or subtraction equation. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 6 + 6 = ?, 5 = ? - 3. 2.OA.3. Determine whether a group of objects (up to 20) is odd or even (e.g., by pairing objects and comparing, counting by 2s). Model an even number as two equal groups of objects and then write an equation as a sum of two equal addends. 2.OA.4. Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns. Write an equation to express the total as repeated addition (e.g., array of 4 by 5 would be 5 + 5 + 5 + 5 = 20). Grade K Grade 1 Grade 2
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