The additive principle lays the groundwork for using expanded notation. Which of the following is an example of expanded notation? (Mark all that apply.)
a. 327 = 3 hundreds + 2 tens + 7 ones
b. 1504 = (1 x 1000) + (5 x 100) + (4 x 1)
c. 245 = 100 + 130 + 15
d. 3472 = 3 x 103 + 4 x 102 + 7x 101 + 2
a, b, d
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