Sophia Learning
Sophia: Significant Figures Addition & Subtraction
A guided lesson explaining how to add and subtract numbers expressing the answer with the appropriate number of significant digits.
Sophia Learning
Sophia: Adding With Significant Figures
A brief presentation helping the learner understand how many significant figures to use when adding numbers.
Khan Academy
Khan Academy: Estimating With Dividing Decimals
Student practice estimating with dividing decimals.
Khan Academy
Khan Academy: Estimating With Subtracting Decimals
Student practice over estimating with subtracting decimals.
Khan Academy
Khan Academy: Estimating With Adding Decimals
For example, estimate 12.93 + 6.1 to be 19. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Khan Academy
Khan Academy: Estimating With Multiplying Decimals
Estimating with multiplying decimals. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Project Britain
Primary Homework Help: Rounding to Nearest 100
The learning activity reviews rounding to the nearest hundred. Students answer ten questions and can check their answers when finished.
BBC
Bb Ci: Review Significant Digits
BBCi presents a test prep review ("revision") section on significant digits and on approximating an answer by rounding in order to work with an easy number. Click on "Test Bite," on the last page to get an interactive quiz.
BBC
Bbc: Skillswise: Rounding and Estimating
This BBC Skillswise tutorial teaches students how to use rounding and estimating to answer math problems--features factsheet, worksheet, quiz, and game links.
Scholastic
Scholastic Teachers: Celebrate the 100th Day of School!
Scholastic has put together 100th day math ideas from several different teachers. Includes "zero, my hero", probability, sorting, measuring, estimating, counting, weighing, money, and other ideas for celebrating the 100th day.
Hunkins Experiments
Hunkin's Experiments:how to Measure the Height of a Tree
Hunkin's Experiments is a group of simple cartoon illustrations of scientific principles. Some would work well in the classroom, but others have little value beyond entertaining students. All of the projects are easy to do. This part...
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Lesson: An Introduction to Estimation and Measurements
Pancakes anyone? Students explore estimation and measurement by learning how to make pancakes. A hands-on lesson designed for students in grades 3-5 where students are engage in hand-on experiences involving measuring volume, converting...
Other
Estimation!
This site offers a computer based tool to help students increase their skill in estimating by using a timer and numberline indicating how close their approximation was to the actual number.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Significant Digits
Find a quick, concise explanation of significant digits. An example is given and clearly explained.
ClassFlow
Class Flow: Estimating
[Free Registration/Login Required] Students will learn the rounding method of estimating whole numbers. Assessment questions are included.