# ISEE Lower Level Math : How to add

## Example Questions

### Example Question #31 : How To Add

If Randy starts watching a movie at 11:46 am and the movie ends at 1:56 pm, how long was the movie?

2 hours and 10 minutes

1 hour and 10 minutes

1 hour and 56 minutes

2 hours and 56 minutes

2 hours and 10 minutes

Explanation:

If Randy started watching a movie at 11:46 am, and the movie ends at 1:56 pm, then to find out how long the movie was, we should first determine how much time elapsed between 11:46 am and 12:00 pm, and then how much time elapsed between 12:00 pm and 1:56 pm.

Between 11:46 a.m. and 12:00 pm, 14 minutes went by.

Between 12:00 pm and 1:56 pm, 1 hour and 56 minutes went by.

Therefore, the length of the movie will be the sum of 1 hour and 56 minutes, plus 14 minutes.

This results in 2 hours and 10 minutes.

### Example Question #32 : How To Add

Randy has a savings account that has  in it. His sister gives him  to put in the account. After this, he then increases the total in his account (including the  from his sister) by  by saving money from his job. How much money does Randy now have in his account (in dollars)?

Explanation:

If Randy had in his account and his sister then gave him , the total in his account would be equal to

A  increase of  would be . Therefore, the total in his account would be equal to the sum of  and , which is .

### Example Question #33 : How To Add

Bernard wants to learn how to surf. The start surfing, he needs a wetsuit, which costs , a beginner's surfboard priced at , and surf wax, which costs . What is the total cost of these materials in dollars?

Explanation:

If Bernard needs to buy a wetsuit, a surfboard, and surf wax, this means he will take on costs of $165,$250, and \$12. The sum of these amounts is below:

### Example Question #34 : How To Add

If Annie had a collection of ten coins and then bought five additional coins, by what percentage did her collection increase?

Explanation:

Given that Annie has  coins, an increase of  coins would mean that her coin collection increased by amount equal to half the size of her current collection. This is therefore equal to a  increase. You can also figure this out by comparing the size of her collection before and after the new coins were added:  (to not count the original size of her collection in the calculation of the percent increase) . Thus,  is the correct answer.

### Example Question #35 : How To Add

If there are  cars and  motorcycles in a parking lot, how many total wheels are there in the parking lot?

Explanation:

Given that a car has  wheels, and a motorcycle has  wheels, if there are  cars and  motorcycles in a parking lot, the total number of wheels can be found by using the expression below:

### Example Question #36 : How To Add

Jenny overslept by half an hour and has class at 8:00 am. Usually she wakes up at 7:00 am. She takes  minutes to shower and brush her teeth,  minutes to dry her hair,  minutes to eat breakfast,  minutes to walk to school, and another  minutes to talk to her friends before class starts. If she skips breakfast and doesn't talk to her friends before class, how late to class will she be?

minutes

minutes

minutes

minutes

minutes

Explanation:

Jenny's usual schedule is to wake up at 7:00 am. She then takes  minutes to shower and brush her teeth,  minutes to dry her hair,  minutes to eat breakfast,  minutes to walk to school, and another  minutes to talk to her friends before class starts. This routine takes up the entire time from when she wakes up to when class begins:

If she wakes up half an hour late at 7:30 am, and skips her  minute breakfast as well has her  minute talk with her friends before class, she will need to take this much time to get to school:

Since she woke up at 7:30, it will be 8:05 when she gets to school, and so she will be  minutes late.

### Example Question #37 : How To Add

Jon buys and sells bicycles. He bought a bicycle for , which he resold for . Another bicycle, he bought for  and resold for . He bought a third bicycle for  but did not realize that it needed repairs. Jon had to spend  on repairs and then sold it for . In dollars, how much profit did Jon make in total from selling the three bikes?

Explanation:

Since Jon bought the first bicycle for  and resold it for , he made  in profit because .

Jon bought the second bicycle for  and resold it for , so he made  in profit because .

Jon bought the third bicycle for  and then sold it for , but because he spent  on repairs, he lost . This is because

Thus, the total profit that he made is  because .

### Example Question #38 : How To Add

What is the value of  given the equations below?

Explanation:

The first step to solve for  is to first solve for x and y.

Here, 4 should be added to each side of the equation. This results in:

Here, 2 should be subtracted from each side of the equation. This results in:

Therefore,   is equal to .

### Example Question #39 : How To Add

If Angela lives 5 miles east of Bill, and Joe lives 3 miles east of Bill, what is the roundtrip distance from Angela's house to Bill's house (in miles)?

Explanation:

If Angela lives 5 miles east of Bill, and Joe lives 3 miles east of Bill, that means that the distance between Angela and Joe will be  miles.

A roundtrip will be two times 8 miles, which is equal to , which is therefore the correct answer.

### Example Question #40 : How To Add

What is the sum of 4.16 and 1.4?