1. How Much Dog Food? By Victoria Kin

2. TEKS  (4.2) Number, operation, and quantitative reasoning. The student describes and compares fractional parts of whole objects or sets of objects. The student is expected to: (A) use concrete objects and pictorial models to generate equivalent fractions.  (4.3) Number, operation, and quantitative reasoning. The student adds and subtracts to solve meaningful problems involving whole numbers and decimals. The student is expected to: (A) use addition and subtraction to solve problems involving whole numbers.  (4.4) Number, operation, and quantitative reasoning. The student multiplies and divides to solve meaningful problems involving whole numbers. The student is expected to: (D) use multiplication to solve problems (no more than two digits times two digits without technology); (E) use division to solve problems (no more than one-digit divisors and three- digit dividends without technology).  (4.11) Measurement. The student applies measurement concepts. The student is expected to estimate and measure to solve problems involving length (including perimeter) and area. The student uses measurement tools to measure capacity/volume and weight/mass. The student is expected to: (B) perform simple conversions between different units of length, between different units of capacity, and between different units of weight within the customary measurement system.  (4.2) Number, operation, and quantitative reasoning. The student describes and compares fractional parts of whole objects or sets of objects. The student is expected to: (A) use concrete objects and pictorial models to generate equivalent fractions.  (4.3) Number, operation, and quantitative reasoning. The student adds and subtracts to solve meaningful problems involving whole numbers and decimals. The student is expected to: (A) use addition and subtraction to solve problems involving whole numbers.  (4.4) Number, operation, and quantitative reasoning. The student multiplies and divides to solve meaningful problems involving whole numbers. The student is expected to: (D) use multiplication to solve problems (no more than two digits times two digits without technology); (E) use division to solve problems (no more than one-digit divisors and three- digit dividends without technology).  (4.11) Measurement. The student applies measurement concepts. The student is expected to estimate and measure to solve problems involving length (including perimeter) and area. The student uses measurement tools to measure capacity/volume and weight/mass. The student is expected to: (B) perform simple conversions between different units of length, between different units of capacity, and between different units of weight within the customary measurement system.

3.  It’s time for BK’s dinner. Uh-oh! Looks like we need to get more dog food for BK.

4. At the pet store….  BK’s dog food comes in three sizes: 5- pound, 17-pound, and 35-pound bag.  The 17-pound and 35-pound bags are too big and heavy to carry.  BK’s dog food comes in three sizes: 5- pound, 17-pound, and 35-pound bag.  The 17-pound and 35-pound bags are too big and heavy to carry.

5.  I wonder how much dog food BK eats in a month. Will a 5 pound bag of dog food last for a month?

6. Let’s gather some facts…  BK eats 1/4 cup of food each meal.  She eats twice a day.  There are 30 days in November.  1 cup = 8 ounces  16 ounces = 1 pound  BK eats 1/4 cup of food each meal.  She eats twice a day.  There are 30 days in November.  1 cup = 8 ounces  16 ounces = 1 pound

7. How much food does BK eat in a month?  BK eats 1/4 cup of food each meal, and she eats twice a day. 2 x 1/4 cup = 1/2 cup, which means she eats 1/2 cup a day.  1/2 cup x 30 days = 15 cups per month.  BK eats 1/4 cup of food each meal, and she eats twice a day. 2 x 1/4 cup = 1/2 cup, which means she eats 1/2 cup a day.  1/2 cup x 30 days = 15 cups per month.

8. How many pounds are 15 cups?  First, I need to find out how many ounces 15 cups are. 1 cup = 8 ounces, this means 15 x 8 ounces = 120 ounces.  Since it takes 16 ounces to convert into 1 pound, then 120 ounces must be divided by 16 120 ounces  16 = 7.5.  BK eats 7.5 pounds of food each month.  First, I need to find out how many ounces 15 cups are. 1 cup = 8 ounces, this means 15 x 8 ounces = 120 ounces.  Since it takes 16 ounces to convert into 1 pound, then 120 ounces must be divided by 16 120 ounces  16 = 7.5.  BK eats 7.5 pounds of food each month.

9. Will a 5-pound bag be enough for 1 month?  A 5-pound bag is not enough for BK, because she eats 7.5 pounds of food for a month.  7.5 - 5 = 2.5  This means BK need 2.5 pounds of food in addition to the 5-pound bag.  A 5-pound bag is not enough for BK, because she eats 7.5 pounds of food for a month.  7.5 - 5 = 2.5  This means BK need 2.5 pounds of food in addition to the 5-pound bag.

10. BK needs more dog food!  If I need the food to last at least a month, I will have to buy the larger bag of dog food for her.