How do you write 7.5 million in Expanded notation using exponents?


2 Answers

lucek chuck Profile
lucek chuck answered
Expanded notation means you look at each digit individually. So 15 is 5 in the ones place and 1 in the tens. In the problem you have above you have 7 in the millionths place and a 5 in the hundred thousands place. The previous poster us scientific notation to simplify this. 10^N is a number starting with 1 and ending with x number of zeros. So a million is 10^6 or 1 followed by 6 0s, 1,000,000.

Or to put it another way, 7 million 5 hundred thousand =7*10^6 + 5*10^5=7.5 million.
Oddman Profile
Oddman answered
7*10^6 + 5*10^5
thanked the writer.
Oddman commented
"Expanded form" is a method of writing numbers as a sum that, in effect, shows the place value of each digit. One way to write 7.5 million in expanded form is 7,000,000 + 500,000. You specifically asked for it to be written using exponents. The customary way of writing an exponent when superscripts are not available is to put a caret (^) in front of it. Thus, 10 to the power of 6 is written 10^6.

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