Exercise 18 Page 122

Raj is writing 32000 as a percent. We want to find his mistake and correct it. Let's start by rewriting the fraction as a percent by ourselves. Then we will compare our solution with Raj's solution. Let's consider the given fraction. 3/2000 Let's start by writing the fraction as a decimal. To do so, we will find the equivalent fraction with a denominator of 10 000. We multiply 2000 by 5 to get 10 000, so we will also multiply 3 by 5 to get the equivalent fraction.

We can see that 32000 can be written as 1510 000. Now let's write 1510 000 as a decimal. 15/10 000 = 0.0015 Finally, we will write 0.0015 as a percent. To write a decimal as a percent, we move the decimal point two places to the right and write the percent symbol. Let's do it!

We found that 32000 can be written as 0.0015, which is 0.15 %. Now let's consider Raj's solution.

Raj incorrectly rewrote the percent. He moved the decimal point four places to the right instead of two. When writing a decimal as a percent, we should always move the decimal point two places to the right, which is equivalent to multiplying it by 100.