Sara adds 45 + 32 by adding 45 + 2 to obtain 47, then by adding 30 to get 77. Determine which content standard her strategy relates to and explain why her strategy should be encouraged.

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The Answer of Sara adds 45 + 32 by adding 45 + 2 to obtain 47, then by adding 30 to get 77. Determine which content standard her strategy relates to and explain why her strategy should be encouraged.

Sara Adds 45 + 32 by Adding 45 + 2