K.4 Addition and Subtraction

K.4  The student models addition (joining) and subtraction (separating)
PK	K	1
V.B1  child uses concrete models or makes a verbal word problem for adding up to 5 objects V.B2  child uses concrete models or makes a verbal word problem for subtracting  1 to 5 objects form a set	K.4A  model and create addition and subtraction problems in real situations with concrete objects  2nd 9 weeks - Addition (join sets to 10) 3rd 9 weeks - Subtraction (seperating sets to 10)	1.3A  model and create addition and subtraction problem situations with concrete objects and write corresponding number sentences. 1.3B  use concrete and pictorial models to apply basic addition and subtraction facts
Model addition problems in real situations with concrete objects Create addition problems in real situations with concrete objects Model subtraction problems in real situations with concrete objects Create subtraction problems in real situations with concrete objects

Activities:

Simple word problem: If I have 4 cars and I take 1 away, how many will I have left?

• Step 1: Use story mats with counters - as teacher tells a simple story the students use manipulatives to join or seperate depending on the story.
• Step 2: Use fingers to show children how to put together a subtraction problem (holds up 4 fingers and takes away 1 finger to show 3 are left)
• Step 3: Teacher provides counters and asks child to devise a story using the objects

Vocabulary:  addition - join  (motion your hand coming together)
                       subtraction - seperate (motion your hand moving apart)

Once students are successful creating addition and subtraction stories verbally, then move on to writing the number sentence with words:   3 and 2 make 5    or   4 seperate 1 is 3
After students understand the vebage teacher can introduce signs: +, -, =

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