## Reflection: Developing a Conceptual Understanding Sizing your Own Cup - Section 3: Exploration on white boards

To combat the problems with rushing to procedure when students learn shortcuts try estimation first! When students have figured out the steps to take, even if they understand why they work, they make careless errors and forget to turn on their brain to check if their answer is reasonable. Asking them first to make an estimate may be enough to remind them to check their final answer, especially if you make them write it down. Before finding 40 percent of 20 ml. I had my class think through a quick estimate. I asked "will it be more or less than 20ml? 10ml? 2ml? How do you know?" When they decided it would be a little less than 10 ml. because 40% is a little less than half I made them write it down. 40% of 20ml. is a little less than 10ml. Then, when some of them got 40ml as an answer most of them immediately knew it was wrong and figured out their mistake.

Estimation is key!
Developing a Conceptual Understanding: Estimation is key!

Unit 8: Exploring Rational Numbers
Lesson 18 of 20

## Big Idea: Students can use 10% as a building block for other percents.

Print Lesson
1 teacher likes this lesson
Standards:
Subject(s):
Math, Number Sense and Operations, Mental Math, multiple methods, Student Choice, rational numbers
54 minutes

### Erica Burnison

##### Similar Lessons

###### Ratios and Percents
6th Grade Math » Unit Rate Applications and Percents
Big Idea: Percent means ‘per 100.’ A percent can be represented using a ratio of ‘a’ to 100.
Favorites(49)
Resources(17)
New Haven, CT
Environment: Urban

###### Budgets
6th Grade Math » The College Project - Working with Decimals
Big Idea: What is a budget? How do we use it and why is it important? Students work on these questions in the context of the College Project.
Favorites(13)
Resources(33)
Somerville, MA
Environment: Urban

###### Converting Fractions and Decimals
6th Grade Math » Fractions, Decimals, and Percents
Big Idea: Students develop the relationship between fractions and decimals.
Favorites(11)
Resources(12)
Brooklyn, NY
Environment: Urban