Question 39: Apply properties of addition and multiplication to calculate quickly: 28 . 64 + 28 . 36

28 . 64 + 28 . 36

= 28.(64 + 36)

= 28,100

= 2800

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Question 39: Apply properties of addition and multiplication to calculate quickly: 28 . 64 + 28 . 36

28 . 64 + 28 . 36

= 28.(64 + 36)

= 28,100

= 2800

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