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Unit 5 Learning Goal B: The student will use number relationships to develop addition strategies within 100.
Learner Goal B:
With teacher help and accommodations:
The student demonstrates an understanding of the foundational concepts will be accepted. The student can solve addition and subtraction real-world problems using objects, drawings or equations to represent the problem. (aligns with MA.1.AR.1.2; foundational to MA.2.AR.1.1)
COUNTING ON and MAKING A 10 are two strategies to fluently add.
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DOUBLE FACTS can help you find the sums of near doubles facts to fluently add.
These are not doubles but near double by 1 or by 2 like in video:
2+3, 3+4, 4+5, 5+6, 6+7, 7+8, 8+9, 9+10...
5.2 More strategies to add within 20
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Base -Ten blocks can help you add 2-digit numbers.
5.3 represent addition with 2 digits
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Addends can be added in ANY ORDER and the sum is the same.
15+21=36
21+15=36
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Decomposing both addends to find the partial sum is one way to add 2 -digit numbers. Numbers that are easy to add are called friendly numbers.
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A number line can help you add two addends.
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I will provide number lines to go home in their math baggie and they will have access to a number line during our lessons, too.
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A more COMPARE situation could be either an addition or a subtraction situation. The question asked is how many more/fewer?
Decomposing one addend can help you add 2-digit numbers.
5.7 Decompose one addend to add
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You can ADJUST addends to make them easier to add.
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A more COMPARE situation could be either an addition or a subtraction situation. The question asked is how many more/fewer?
A COMPARE situation could be either an addition situation or a subtraction situation.
You can use addition to represent and solve a compare problem.
5.9 True Addition (determine if true or false)
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5.10 Determine the unknow in an addition
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A more COMPARE situation could be either an addition or a subtraction situation. The question asked is how many more/fewer?
MA.1.NSO.2.1: Recall addition facts with sums to 10 and related subtraction facts with automaticity.
MA.2.NSO.2.1: Recall addition facts with sums to 20 and related subtraction facts with automaticity.
MA.2.NSO.2.3: Add two whole numbers with sums up to 100 with procedural reliability. Subtract a whole number from a whole number, each no larger than 100, with procedural reliability.