Question: How do you use the standard algorithm to subtract 215-72? Provide justifications for each step. 14 + 23 = (1 . 10 + 4) +

How do you use the standard algorithm to subtract 215-72? Provide justifications for each step.

14 + 23 = (1 . 10 + 4) + (2 . 10 + 3) Expanded form = (1 . 10 + 2 . 10) + (4 + 3) Commutative and associative properties of addition = (1 + 2)10 + (4+ 3) Distributive property of multiplication over addition = 3 . 10 + 7 Single-digit addition facts = 37 Place value

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