# Estimation and Benchmarks for Weights

Videos to help Grade 3 students learn how to develop estimation strategies by reasoning about the weight in kilograms of a series of familiar objects to establish mental benchmark measures.

Common Core Standards: 3.NBT.2, 3.MD.2, 3.NBT.8

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Lesson Plans and Worksheets for Grade 3

Lesson Plans and Worksheets for all Grades

New York State Common Core Math Module 2, Grade 3, Lesson 7

Concept Development

Part 1: Become familiar with scales.
Part 2: Exploration Activity

Problem Set

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.
E. Circle the correct unit of weight for each estimation.
1. A box of cereal weighs about 350 (grams / kilograms).
2. A watermelon weighs about 3 (grams / kilograms).
3. A postcard weighs about 6 (grams / kilograms).
4. A cat weighs about 4 (grams / kilograms).
5. A bicycle weighs about 15 (grams / kilograms).
6. A lemon weighs about 58 (grams / kilograms).

Homework

1. Match the object with its approximate weight.

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? How do you know?

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

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