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Bar Model is also excellent way to show division.

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OA: Great for K and beginning of 1st grade (Topic 1)

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OA: Great for K and beginning of 1st grade (Topic 1)

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OA: Great for K and beginning of 1st grade (Topic 1)

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OA: Great for K and beginning of 1st grade (Topic 1)

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Addition is the correct answer as the word is "addend". But notice how addition and subtraction are opposites operations and either one can be used to solve a word problem to find the part. Finding the missing addend is often more natural than subtraction.

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OA: (Topic 1) 1st grade anchor: What operation do we use: addition or subtraction?

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OA: (Topic 1) 1st grade anchor: What operation do we use: addition or subtraction?

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3 + ___ = 10 (Solution is addition)

10 - 3 = 7 (Solution is subtraction)

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Concrete items must be used in class to have the full range of CPA. Real items like egg cartoons, etc to show arrays. In class students can use: unifix cubes, counters, even beans on centimeter paper to show arrays.

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Mental Math Strategies for 3-digit addition

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Mental Math Strategies for 3-digit addition

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OA: (Topic 1) Extremely important for 1st and 2nd grades (addition and subtraction) as well as 3rd and 4th grade (multiplication and division).

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OA: (Topic 1) Extremely important for 1st and 2nd grades (addition and subtraction) as well as 3rd and 4th grade (multiplication and division).

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OA: Mrs. McPleasant's 3D anchor charts with ways to add! (FABULOUS!)

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OA: Mrs. McPleasant's 3D anchor charts with ways to add! (FABULOUS!)

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This went above any beyond expectations!

Notice the vocabulary from the word wall is displayed for students and will go up on the word wall once discussed and used.

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In Green - divisor, Partial Quotient and Final Quotients; In Red - Products to be subtracted; in blue remainders

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Note: Many people put the final quotient as a sum on the bottom (next to the 0)

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Partial Sums (for 2 digit addition) - think about place value when adding!

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Partial Sums (for 2 digit addition) - think about place value when adding!

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Let's this this with students and hoola-hoops!

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Decomposing - an opportunity to really teach what the equal sign means!   5 = 2 + 3

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Decomposing - an opportunity to really teach what the equal sign means!   5 = 2 + 3

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Showing Multiplication using number lines

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Showing Multiplication using number lines