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Regrouping whole numbers
A number like 675 is really an addition problem. Each place value is added together to form the sum (the number). If we regroup the numbers thereby changing the individual place values, we still don't change the outcome. It's still the same number!
Rounding Whole Numbers
Rounding Numbers - Rounding Decimals - YourTeacher.com
Students learn to round a decimal to a given place using the following steps. First find the digit in the rounding position. Next look at the digit to the right of the rounding position. If the digit to right of the rounding position is greater than or equal to five round up. Then change all digits to the right of the rounding place to zero. Finally we can drop off any zeros to the right of the decimal as long as they are also to the right of the round position. Good review and instruction for all level students.
Estimating Sums and Differences | MathHelp.com
Rounding Numbers | Rounding Decimals | MathHelp.com
Math Antics - Place Value
Percent Increase | MathHelp.com
How to Round Decimals | Math with Mr. J
Math Antics - Converting Base-10 Fractions
Big Changes in the Big Apple: Crash Course Kids #38.1
Converting to Scientific Notation
Math Antics - Calculating Percent Change
What is Climate Change? Crash Course Geography #14
Dividing by multiples of 10, 100, and 1,000.
Math Antics - Rounding
Shifts in Equilibrium
Learn to Convert Decimals to Fractions (Change a Decimal into a Fraction) - 
Quality Math And Science Videos that feature step-by-step example problems!