Question

A row of tiny red beads is placed at the beginning and at the end of a 20-centimeter bookmark

A row of the same beads is also placed every 4 millimeters along the bookmark
How many rows of the beads are used on the bookmark?
Enter your answer in the box

Answer 1

There are 50 beads on the bookmark.

Explanation:

To know the number of rows of the beads are used on the bookmark, we just need to divide.

Notice that the bookmark is 20 centimeters long, and each bead is 4 milimiters. In order to divide, we need to transform centimeters to millimeters.

We know that 1 centimeter is 10 millimeters, that means 20 centimeters is 200 millimeters.

Then, the division is

`(200mm)/(4mm) =50`

Therefore, there are 50 beads on the bookmark.