Curated Video
Fundraiser (Use mental math estimation and rounding to solve word problems.)
Third class had a small fund raiser. The table below shows the money raised on each day last week. About how much money did they raise last week?
Wonderscape
Science Kids: The Adorable World of Pandas
This video provides a comprehensive look at pandas, explaining why they are considered adorable and discussing their physical features, behavior, and habitat. It also covers their life cycle and the conservation efforts that have helped...
Curated Video
EASY Method Multiply Two Numbers Ending In 5 (Fast Math Trick)
Can you multiply 35 by 115 in your head? Learn this neat math trick of how to multiply two numbers that end in the digit 5. You can use it to estimate many other problems. The video also contains a proof of why the method works. Learn...
Curated Video
Estimating Length with a Mental Ruler
By creating a mental picture of a ruler and comparing it to the object, one can make a reasonable estimate. This skill helps in achieving measurements that are pretty close to the desired length.
Curated Video
Horse Barn (Part 1) (Use estimation to solve multi-step word problems involving multiplication and division.)
MacDonald wants to buy grain to feed his 4 horses. He went to the shop where they sell grain in bags of 6 pounds each. A horse needs at least 8 pounds of grain. He wasn’t sure how many bags he should buy….but he estimated that he will...
Curated Video
Horse Barn (Part 2) (Use estimation to solve multi-step word problems involving multiplication and division.)
MacDonald wants to buy grain to feed his 4 horses. He went to the shop where they sell grain in bags of 6 pounds each. A horse needs at least 8 pounds of grain. He wasn’t sure how many bags he should buy….but he estimated that he will...
Curated Video
Estimating to Check Reasonableness
In this video, the teacher explains how to use estimation to check if an answer is reasonable. They demonstrate how to round numbers and use compatible numbers to make estimations in different math problems.
Curated Video
Rounding and Estimating
Mr. Addit explains rounding and estimating and teaches how to use estimation to add, subtract, and multiply. He models how to estimate products in multiplication math problems.
Curated Video
VERY HARD Puzzle: What Is The Distance Between Two Random Points In A Square?
What is the average distance between two randomly chosen points in a square with a side length 1? The video presents how to estimate the answer and also derives the exact answer using integrals. Per suggestions in the comments, I have...
Curated Video
Counter-Intuitive Probability Puzzle: Random Walkers Meeting On A Grid
Alice and Bob start at opposite corners of a 5x5 grid. Alice moves up/right randomly and Bob moves down/left randomly. What is the chance they meet? What happens for an nxn grid? As n goes to infinity, the answer is interesting and...
Curated Video
5 Facts You Should Know About Pi (Happy Pi Day!)
Happy Pi Day! At 3/14/15 at 9:26 the time will be accurate to pi for 7 decimal places. What's your favorite fact about pi? Links to proofs and more below in the description. 1. The definition 00:10 Related: the area of circle intuitive...
Bizarre Beasts
Extinction, A Pyramid Scheme, & The World's Largest Salamander
Releasing Chinese giant salamanders back into the wild sounds like a good idea, but it's causing problems for the salamanders and for our understanding of what a species even is.
Curated Video
Estimating Length: Comparing Objects to Make Educated Guesses
In this video, the teacher explains the concept of estimation and how to estimate the length of an object by comparing it to other objects. The teacher provides examples using body parts as reference points for estimation, and also...
Curated Video
Anorexia and Eating Disorders | Health | Biology | FuseSchool
Anorexia and Eating Disorders | Health | Biology | FuseSchool In this video we are going to cover eating disorders, and in particular, anorexia. You may not be aware of this, but four out of 10 people have either personally experienced...
Curated OER
How Do You Mentally Find Percents That are Powers of 10?
Powers of 10 are about moving the decimal around. The instructor illustrates how to move the decimal when it's ten percent or it's one percent. Once you understand this procedure you can do the mental math, in your head of course!
Curated OER
How Do You Mentally Find Percents That are Powers of 10?
Powers of 10 are about moving the decimal around. The instructor illustrates how to move the decimal when it's ten percent or it's one percent. Once you understand this procedure you can do the mental math, in your head of course!
Curated OER
How Do You Use Compatible Numbers to Estimate a Part of a Whole?
What are compatible numbers? What are they used for? Is it like estimating? Is it like rounding numbers? The teacher will answer these questions and explain how to use compatible numbers.
Virtual Nerd
Virtual Nerd: How Do You Estimate a Multiplication Problem by Rounding?
This tutorial demonstrates how to estimate the answer to a word problem by multiplying mentally. [3:27]