# 1.5 Divide whole numbers  (Page 2/12)

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Dental floss One package of dental floss is $54$ feet long. Brian uses $2$ feet of dental floss every day. How many days will one package of dental floss last Brian?

Mixed Practice

In the following exercises, solve.

Miles per gallon Susana’s hybrid car gets $45$ miles per gallon. Her son’s truck gets $17$ miles per gallon. What is the difference in miles per gallon between Susana’s car and her son’s truck?

The difference is 28 miles per gallon.

Distance Mayra lives $53$ miles from her mother’s house and $71$ miles from her mother-in-law’s house. How much farther is Mayra from her mother-in-law’s house than from her mother’s house?

Field trip The $45$ students in a Geology class will go on a field trip, using the college’s vans. Each van can hold $9$ students. How many vans will they need for the field trip?

They will need 5 vans for the field trip

Potting soil Aki bought a $128$ ounce bag of potting soil. How many $4$ ounce pots can he fill from the bag?

Hiking Bill hiked $8$ miles on the first day of his backpacking trip, $14$ miles the second day, $11$ miles the third day, and $17$ miles the fourth day. What is the total number of miles Bill hiked?

Bill hiked 50 miles

Reading Last night Emily read $6$ pages in her Business textbook, $26$ pages in her History text, $15$ pages in her Psychology text, and $9$ pages in her math text. What is the total number of pages Emily read?

Patients LaVonne treats $12$ patients each day in her dental office. Last week she worked $4$ days. How many patients did she treat last week?

LaVonne treated 48 patients last week.

Scouts There are $14$ boys in Dave’s scout troop. At summer camp, each boy earned $5$ merit badges. What was the total number of merit badges earned by Dave’s scout troop at summer camp?

## Writing exercises

Explain how you use the multiplication facts to help with division.

Oswaldo divided $300$ by $8$ and said his answer was $37$ with a remainder of $4.$ How can you check to make sure he is correct?

## Everyday math

Contact lenses Jenna puts in a new pair of contact lenses every $14$ days. How many pairs of contact lenses does she need for $365$ days?

Jenna uses 26 pairs of contact lenses, but there is 1 day left over, so she needs 27 pairs for 365 days.

Cat food One bag of cat food feeds Lara’s cat for $25$ days. How many bags of cat food does Lara need for $365$ days?

## Self check

After completing the exercises, use this checklist to evaluate your mastery of the objectives of this section.

Overall, after looking at the checklist, do you think you are well-prepared for the next Chapter? Why or why not?

## Introduction to Whole Numbers

Identify Counting Numbers and Whole Numbers

In the following exercises, determine which of the following are (a) counting numbers (b) whole numbers.

$0,2,99$

1. 2, 99
2. 0, 2, 99

$0,3,25$

$0,4,90$

1. 4, 90
2. 0, 4, 90

$0,1,75$

Model Whole Numbers

In the following exercises, model each number using $\text{base-10}$ blocks and then show its value using place value notation.

258

104

Identify the Place Value of a Digit

In the following exercises, find the place value of the given digits.