## Engage NY Eureka Math 3rd Grade Module 7 Lesson 16 Answer Key

### Eureka Math Grade 3 Module 7 Lesson 16 Pattern Sheet Answer Key

Multiply.

multiply by 9 (6–10)

Answer:

Explanation:

9 × 5 = 45

9 × 6 = 54

9 × 7 = 63

9 × 8 = 72

9 × 9 = 81

9 × 10 = 90.

### Eureka Math Grade 3 Module 7 Lesson 16 Problem Set Answer Key

Question 1.

Find the perimeter of 10 circular objects to the nearest quarter inch using string. Record the name and perimeter of each object in the chart below.

Object |
Perimeter (to the nearest quarter inch) |

Cap of my jam jar | 13\(\frac{1}{4}\) inches |

Bangle | 17\(\frac{1}{4}\) inches |

Plate of my Dog | 34\(\frac{1}{4}\) inches |

Plastic glass Mouth | 21\(\frac{3}{4}\) inches |

Lid of my Lunch Box | 29\(\frac{3}{2}\) inches |

Ear ring | 2\(\frac{2}{4}\) inches |

Water Bottle cap | 7\(\frac{2}{4}\) inches |

Pencil Mouth | 1\(\frac{2}{4}\) inches |

Pen Cap | 3\(\frac{1}{4}\) inches |

Perfume Bottom surface | 12\(\frac{3}{4}\) inches |

a. Explain the steps you used to find the perimeter of the circular objects in the chart above.

Answer:

Step 1: Took a string and wrapped around the object.

Step 2: Marked the string met.

Step 3: Measured the length of the string.

Explanation:

First I rolled the String around the object. Later, I marked the string met. Afterwards, I took a ruler to measure the length of the string.

b. Could the same process be used to find the perimeter of the shape below? Why or why not?

Answer: Yes, the same steps would be followed to find the perimeter of the given shape because I use the string to find the perimeter.

Explanation:

The same steps would be followed to find the perimeter of the given shape because I use the string to find the perimeter. First I rolled the String around the object. Later, I marked the string met. Afterwards, I took a ruler to measure the length of the string.

Question 2.

Can you find the perimeter of the shape below using just your ruler? Explain your answer.

Answer:

No, I cant find the perimeter of this given shape because it got curve line in it as which a ruler cant measure it.

Explanation:

A tool used to rule straight lines and measure distances is called as ruler.

No, I cant find the perimeter of this given shape because it got curve line in it as a ruler measures only straight lines.

Question 3.

Molly says the perimeter of the shape below is 6 \(\frac{1}{4}\) inches. Use your string to check her work. Do you agree with her? Why or why not?

Answer:

No, she is not correct has I have used my string and found the perimeter of the shape as 5 \(\frac{3}{4}\) inches.

Explanation:

Molly says the perimeter of the shape below is 6 \(\frac{1}{4}\) inches.

No, she is not correct has I have used my string and found the perimeter of the shape as 5 \(\frac{3}{4}\) inches.

Question 4.

Is the process you used to find the perimeter of a circular object an efficient method to find the perimeter of a rectangle? Why or why not?

Answer:

No, I don’t think this process to find the perimeter of a circular object an efficient method to find the perimeter of a rectangle, because I can just use a ruler to measure length of the straight lines.

Explanation:

No, I don’t think this process to find the perimeter of a circular object an efficient method to find the perimeter of a rectangle. A ruler is used to find the lengths of the straight lines which help in finding the perimeter of the shape.

### Eureka Math Grade 3 Module 7 Lesson 16 Exit Ticket Answer Key

Use your string to the find the perimeter of the shape below to the nearest quarter inch.

Answer:

The perimeter of this circular shape is 26 3/4 inches.

Explanation:

I used my string to measure this circular shape. The perimeter of this circular shape is 26 3/4 inches.

### Eureka Math Grade 3 Module 7 Lesson 16 Homework Answer Key

Question 1.

a. Find the perimeter of 5 circular objects from home to the nearest quarter inch using string. Record the name and perimeter of each object in the chart below.

Object |
Perimeter (to the nearest quarter inch) |

Example: Peanut Butter Jar Cap | 9\(\frac{1}{2}\) inches |

Cap of my jam jar | 13\(\frac{1}{4}\) inches |

Plate of my Dog | 34\(\frac{1}{4}\) inches |

Lid of my Lunch Box | 29\(\frac{3}{2}\) inches |

Water Bottle cap | 7\(\frac{2}{4}\) inches |

Pen Cap | 3\(\frac{1}{4}\) inches |

b. Explain the steps you used to find the perimeter of the circular objects in the chart above.

Answer:

Well, as previously discussed I have used a string to measure the perimeter of the circular shapes. I wrapped string around the circular bodies and noted the values where they met. Later I have used a ruler to measured the values.

Explanation:

Used string to measure the perimeter of the circular shapes. I wrapped string around the circular bodies and noted the values where they met. Later I have used a ruler to measured the values.

Question 2.

Use your string and ruler to find the perimeter of the two shapes below to the nearest quarter inch.

a. Which shape has a greater perimeter?

b. Find the difference between the two perimeters.

Answer:

a. The perimeter of the given shape B is greater by 3inches than The perimeter of the given shape A.

b. The perimeter of the shape B given using string – The perimeter of the shape A given using string

= 17 1/4 inches – 14 1/4 inches

= 3 inches

Explanation:

a. The perimeter of the given shape A using string = 14 1/4 inches.

The perimeter of the given shape B using string = 17 1/4 inches.

b. Difference:

The perimeter of the shape B given using string – The perimeter of the shape A given using string

= 17 1/4 inches – 14 1/4 inches

= 3 inches.

Question 3.

Describe the steps you took to find the perimeter of the objects in Problem 2. Would you use this method to find the perimeter of a square? Explain why or why not.

Answer:

Step 1: Took a string and wrapped around the given shape A.

Step 2: Marked the string met.

Step 3: Measured the length of the string using ruler.

Step 4: Took a string and wrapped around the given shape B.

Step 5: Marked the string met.

Step 6: Measured the length of the string using ruler.

No, I cant use this process of finding perimeter for Square because Square’s perimeter can be found easily using ruler directly. For finding the perimeter of circular shapes we use string n later the ruler.

Explanation:

First I rolled the String around the given shape A. Later, I marked the string met. Afterwards, I took a ruler to measure the length of the string. same I did with the given shape B.

For finding the perimeter of circular shapes we use string n later the ruler, to know their measurement value. Square is a straight line shape, we can use ruler directly to find its perimeter no need of string.