Use this video to show older elementary mathematicians that they can compare numbers using the same thinking that they did when they were in the first grade. Sal compares decimal numbers using the greater than and less than symbols. He...

Estimation is a good way to build and assess a student's number sense. Watch as Sal uses estimation to solve a problem where he must determine how much 'Janelle' ran during a 4-day period. He calculates the exact amount and compares the...

Rounding numbers is an essential skill to have for all math classes. Sometimes those decimal numbers are just too big, and sometimes an answer should only be given out to the hundredths (like money). So watch this video to see the rules...

Review some long division that contains a decimal number. Do the division first and when that is completed then figure out where the decimal goes in the answer. Just don't let those decimals make you crazy about doing the long division.

Can you put a million zeros on the right side of a decimal number? Well, there are a couple of rules you have to follow to do that. One - it has to be on the right side of the decimal. Two- there can't be any numbers after all those...

Many young mathematicians skip problems like this because they just don't want to do the work to figure it out. A series of fractions and decimal numbers that they have to put in some order. So they have to do some converting and if long...

What is the mode of a data set? Mean, mode, median. Get confused in remembering which is which? Mode is the number that appears the most times in a data set. So given a data set, arrange the numbers in numerical value from least to...

A series of fractions, decimal numbers, and percentages that have to be put in some order. Many young mathematicians skip problems like this because they have to do some converting and if long division is involved many definitely skip...