All the solutions provided in **McGraw Hill Math Grade 5 Answer Key PDF Chapter 9 Lesson 2 Metric Units of Mass **are as per the latest syllabus guidelines.

## McGraw-Hill Math Grade 5 Answer Key Chapter 9 Lesson 2 Metric Units of Mass

**Solve.
**Question 1.

Mr. Wayne bought a watermelon with a mass of 1.89 kilograms. What is the mass of the watermelon in grams?

Answer:

1890 g is the mass of the watermelon in grams.

Explanation:

Number of kilograms is the watermelon Mr. Wayne bought = 1.89.

Conversion:

1 kg = 1000 g.

Number of grams is the watermelon Mr. Wayne bought = 1.89 × 1000

= 1890.

Question 2.

Ken’s dog is 4,200 grams. Sharon’s dog is 7,600 grams. What is the sum of the mass of both dogs in kilograms?

Answer:

11.8 kg is the sum of the mass of both dogs in kilograms.

Explanation:

Number of grams Ken’s dog = 4200.

Number of grams Sharon’s dog = 7600.

Total number of grams of both dogs = Number of grams Ken’s dog + Number of grams Sharon’s dog

= 4200 + 7600

= 11800.

Conversion:

1 kg = 1000 g.

=> 11800 g = 11800 ÷ 1000

=> 11.8 kg.

Question 3.

A company has a pile of steel pipes with a total mass of 19,450 kg. The pipes need to be shipped by truck, but the company’s truck can safely hold only 10 metric tons. How many trips will it take to ship all of the steel pipes? How do you know?

Answer:

Number of trips will it take to ship all of the steel pipes = 1.945.

Explanation:

Total number of kilograms a company has a pile of steel pipes = 19,450.

Number of metric tons the company’s truck can safely hold = 10.

Conversion:

1 metric ton = 1000 kilograms.

=> Total number of kilograms a company has a pile of steel pipes = 19450 ÷ 1000

=> 19.45 metric tons.

Number of trips will it take to ship all of the steel pipes = 19.45 ÷ 10

= 1.945.

Question 4.

A serving of cottage cheese is considered to be 113 grams. What is the mass of a serving of cottage cheese in milligrams?

Answer:

113000 mg is the mass of a serving of cottage cheese in milligrams.

Explanation:

Number of grams of a serving of cottage cheese is considered to be = 113.

Conversion:

1 gram = 1000 milligrams.

Number of milligrams of a serving of cottage cheese is considered to be = 113 × 1000

= 113000.

Question 5.

A science experiment calls for 130 mg of cobalt chloride and 190 mg of water. What is the difference between these two amounts in grams?

Answer:

0.06 g is the difference between these two amounts in grams.

Explanation:

Number of milligrams a science experiment calls for of cobalt chloride = 130.

Number of milligrams a science experiment calls for of water = 190.

Difference:

Number of milligrams a science experiment calls for of water – Number of milligrams a science experiment calls for of cobalt chloride

= 190 – 130

= 60.

Conversion:

1 g = 1000 mg.

=> 60mg = 60 ÷ 1000 = 0.06 g.

Question 6.

An elephant at a zoo has a mass of 6.8 metric tons. A rhinoceros at the same zoo has a mass of 2.2 metric tons, and a hippopotamus has a mass of 2.9 metric tons. What is the sum of the mass of these three animals in kilograms?

Answer:

11900 kgs is the sum of the mass of these three animals in kilograms.

Explanation:

Number of metric tons an elephant at a zoo = 6.8.

Number of metric tons a rhinoceros at a zoo = 2.2.

Number of metric tons a hippopotamus at a zoo = 2.9.

Total number of metric tons of three animals = Number of metric tons an elephant at a zoo + Number of metric tons a rhinoceros at a zoo + Number of metric tons a hippopotamus at a zoo

= 6.8 + 2.2 + 2.9

= 9.0 + 2.9

= 11.9.

Conversion:

1 metric ton = 1000 kgs.

=> Total number of metric tons of three animals = 11.9 × 1000

=> 11900.