Understanding Decimal Fractions: Zeros to the Right of the Decimal
This clip explains that adding extra zeros following a number or numbers to the right of a decimal point does not change the value of the decimal.
Understanding Decimal Fractions: Reading Decimal Fractions: Using Words
This clip explains how to read and say decimals using words. It makes the point that the word "and" is only used to indicate the position of the decimal point.
Exponents: Powers of Ten
This clip explains that if we write the number 10 to different powers, the exponent simply tells us the number of zeroes to the right of the 1. The clip then goes on to explain how exponents can be especially useful in expanded notation.
Subtracting Whole Numbers: Borrowing
This clip uses expanded notation to demonstrate the technique known as borrowing in subtracting both two and three-digit numbers.
Subtracting Whole Numbers: Using Columns to Subtract Two-Digit Numbers
This clip explains the use of columns when doing subtraction problems with "larger numbers." With this approach, we subtract "ones from ones, tens from tens (and), hundreds from hundreds."
Addition of Whole Numbers, Part 2: Carrying
This clip explains what it means to carry when adding multi-digit whole numbers.
Addition of Whole Numbers, Part 2: Three Things to Remember About Addition of Whole Numbers
This clip reviews the key points about adding whole numbers. The first of these is that there are 100 addition facts that need to be memorized. The second is the idea of expanded notation. Third is the notion that, when we add, we can rearrange and ...
Addition of Whole Numbers, Part 2: Summary: Addition of Whole Numbers, Part Two
This clip summarizes the process of finding the sum of two or more whole numbers and, in so doing, revisits the use of expanded notation.