Exercise 15 Page 347

We want to round the given decimal number and write the result as the product of a single digit and a power of 10. 1 003 111 391 008Let's start by rounding the given number to the nearest 1 000 000 000 000. Since the digit in the hundred-billions place is less than 5, we will not modify the digit in the trillons place. 1 003 111 391 008≈ 1 000 000 000 000 Finally, we will write the above number as the product of a single digit and a power of 10.