Add Two-Digit Numbers (With Composing)

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Standard Alignments:

(B) Add up to four two-digit numbers and subtract two-digit numbers using mental strategies and algorithms based on knowledge of place value and properties of operations

AU Math: ACMNA030

(Y2) Solve simple addition and subtraction problems using a range of efficient mental and written strategies (ACMNA030)

CCSS Math: 2.NBT.5

2.NBT.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.