| A | B |
| decimal | value to the right of the decimal is less than one or part of a whole |
| decimal point | the dot in a decimal |
| scientific notation | a number written as the product of a decimal number and power of 10 |
| tally | a way to keep count |
| frquency table | a table that shows counts of items in different groups |
| Multiplication by 10 rule | move the decimal one place to the right |
| Multiplication by 100 rule | Move the decimal two places to the right |
| Multiplication by 1000 rule | Move the decimal three places to the right |
| Division by 10 rule | Move the decimal one place to the left |
| Division by 100 rule | Move the decimal two places to the left |
| Division by 1000 rule | Move the decimal three places to the left |
| Addition and subtraction rule | line up the decimals, then add or subtract |
| Multiplication rule | Multiply, count decimal places, then move decimal from right to left that number |