Añadir y restar dentro de 20
2nd Grade
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Alabama Course of Study Standards:
2
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Fluently add and subtract within 20 using mental strategies such as counting on, making ten, decomposing a
number leading to ten, using the relationship between addition and subtraction, and creating equivalent but easier
or known sums.- State automatically all sums of two one-digit numbers.
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Arkansas Academic Standards:
2.OA.2
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- Fluently add and subtract within 20 using mental strategies
- By the end of Grade 2, know from memory all sums of two one-digit numbers
Note: Fact fluency means that students should have automaticity when recalling these facts.
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Arizona - K-12 Academic Standards:
2.OA.2
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Fluently add and subtract within 20. By the end of Grade 2, know from memory all sums of two one-digit numbers. |
Common Core State Standards:
Math.2.OA.2 or 2.OA.2
Ohio's Learning Standards:
2.OA.2
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Fluently add and subtract within 20 using mental strategies.
By end of Grade 2, know from memory all sums of two one-digit
numbers. See standard 1.OA.6 for a list of mental strategies. |
Georgia Standards of Excellence (GSE):
2.NR.2.1
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Fluently add and subtract within 20 using a variety of mental, part-whole strategies. |
Massachusetts Curriculum Frameworks:
2.OA.2
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Fluently add and subtract within 20 using mental strategies.9 By end of grade 2, know from memory all sums of two single-digit numbers and related differences. For example, the sum 6 + 5 = 11 has related differences of 11 – 5 = 6 and 11 – 6 = 5. |
North Carolina - Standard Course of Study:
2.OA.2
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Demonstrate fluency with addition and subtraction, within 20, using mental strategies. |
New York State Next Generation Learning Standards:
2.OA.2
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- Fluently add and subtract within 20 using mental strategies. Strategies could include:
- counting on;
- making ten;
e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14 - decomposing a number leading to a ten;
e.g., 13 - 4 = 13 = 3 - 1 = 10 - 1 = 9 using the relationship between addition and subtraction; and e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4
- creating equivalent but easier or known sums.
e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13 - Know from memory all sums within 20 of two one-digit numbers.
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Tennessee Academic Standards:
2.OA.2
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Fluently add and subtract within 30 using mental strategies. By the end of 2nd grade, know from memory all sums of two one-digit numbers and related
subtraction facts. |
Wisconsin Academic Standards:
2.OA.2
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Flexibly and efficiently add and subtract within 20 using multiple mental strategies which may
include counting on; making ten; decomposing a number leading to a ten; using the relationship
between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and
creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6
+ 6 + 1 = 12 + 1 = 13). |
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