## Engage NY Eureka Math 3rd Grade Module 2 Lesson 7 Answer Key

### Eureka Math Grade 3 Module 2 Lesson 7 Problem Set Answer Key

Work with a partner. Use the corresponding weights to estimate the weight of objects in the classroom. Then, check your estimate by weighing on a scale.

A.

Objects that Weigh About 1 Kilogram |
Actual Weight |

A Water bottle | 980g |

A Dictionary | 1100g |

My shoes | 1250g |

B.

Objects that Weigh About 100 grams |
Actual Weight |

A Notebook | 110g |

An Apple | 95g |

A Pencil box | 108g |

C.

Objects that Weigh About 10 grams |
Actual Weight |

An Eraser | 8g |

A Marker | 12g |

My Bracelet | 9g |

D.

Objects that Weigh About 1 gram |
Actual Weight |

A Coin | 2g |

A Pencil | 4g |

A Sharpener | 3g |

E. Circle the correct unit of weight for each estimation.

Question 1.

A box of cereal weighs about 350 (grams / kilograms).

Question 2.

A watermelon weighs about 3 (grams / kilograms).

Question 3.

A postcard weighs about 6 (grams / kilograms).

Question 4.

A cat weighs about 4 (grams / kilograms).

Question 5.

A bicycle weighs about 15 (grams / kilograms).

Question 6.

A lemon weighs about 58 (grams / kilograms).

F. During the exploration, Derrick finds that his bottle of water weighs the same as a 1-kilogram bag of rice. He then exclaims, “Our class laptop weighs the same as 2 bottles of water!” How much does the laptop weigh in kilograms? Explain your reasoning.

Answer:

The laptop weighs 2kg.

Explanation:

Derrick finds that his bottle of water weighs the same as a 1-kilogram bag of rice and he says that class laptop weighs the same as 2 bottles of water.So, If 1 bottle of water weighs 1 kg then 2 bottles of water weighs 2 kg.Therefore laptop weighs 2kg.

G. Nessa tells her brother that 1 kilogram of rice weighs the same as 10 bags containing 100 grams of beans each. Do you agree with her? Explain why or why not.

Answer:

Yes, 1 kilogram of rice weighs the same as 10 bags containing 100 grams of beans each.

Explanation:

Yes, because 10 X 100g=1000g and as we know 1000g is equal to 1 kilogram.

### Engage NY Math 3rd Grade Module 2 Lesson 7 Exit Ticket Answer Key

Question 1.

Read and write the weights below. Write the word kilogram or gram with the measurement.

Question 2.

Circle the correct unit of weight for each estimation.

a. An orange weighs about 200 (grams / kilograms).

b. A basketball weighs about 624 (grams / kilograms).

c. A brick weighs about 2 (grams / kilograms).

d. A small packet of sugar weighs about 4 (grams / kilograms).

e. A tiger weighs about 190 (grams / kilograms).

### Eureka Math 3rd Grade Module 2 Lesson 7 Homework Answer Key

Question 1.

Match each object with its approximate weight.

Question 2.

Alicia and Jeremy weigh a cell phone on a digital scale. They write down 113 but forget to record the unit. Which unit of measurement is correct, grams or kilograms? How do you know?

Question 3.

Read and write the weights below. Write the word kilogram or gram with the measurement.