Solve: 10·10²·10⁻⁴·10¹⁰ Using Powers of 10

Question

101021041010= 10\cdot10^2\cdot10^{-4}\cdot10^{10}=

Video Solution

Solution Steps

00:09 Let's solve this problem together.
00:12 When we multiply powers with the same base, we add the exponents.
00:18 We can use this rule for any number of bases. Isn't that cool?
00:24 Now, let's apply this rule to our exercise.
00:28 Remember, a number without an exponent is really to the power of 1.
00:38 Since all powers have the same base, we can use our formula.
00:45 Let's add all the exponents together now.
00:52 We'll do each step one at a time, then add them up.
00:58 And there you have it, that's the solution!

Step-by-Step Solution

We use the power property to multiply terms with identical bases:

aman=am+n a^m\cdot a^n=a^{m+n} Keep in mind that this property is also valid for several terms in the multiplication and not just for two, for example for the multiplication of three terms with the same base we obtain:

amanak=am+nak=am+n+k a^m\cdot a^n\cdot a^k=a^{m+n}\cdot a^k=a^{m+n+k} When we use the mentioned power property twice, we could also perform the same calculation for four terms of the multiplication of five, etc.,

Let's return to the problem:

First keep in mind that:

10=101 10=10^1 Keep in mind that all the terms of the multiplication have the same base, so we will use the previous property:

1011021041010=101+24+10=109 10^1\cdot10^2\cdot10^{-4}\cdot10^{10}=10^{1+2-4+10}=10^9

Therefore, the correct answer is option c.

Answer

109 10^9