| A | B |
|---|
| adding and subtracting decimals | line up decimals |
| adding integers same sign | add and keep sign |
| adding integers different signs | subtract and keep sign of largest number |
| of | multiply |
| is | is equal to |
| per cent of number | write decimal as percent and multiply |
| change decimal to % | move decimal two places to right |
| change % to decimal | move deimalo two places to left |
| tips | change % to decimal and multiply by amount of bill before tax is added. |
| area of rectangle or parallelogram | A = bh b= base, h = height |
| least common multiple LCM | use factor tree; circle all prime numbers; write them in exponent form; multiple each prime with highest exponent. Example: LCM 6 and 9; 6 = 2 x 3, and 9 = 3 squared, 2 x 3 squared = 18 |
| absolute value | just drop sign |
| rounding numbers | 1. underline digit in the place you are rounding to 2. look at the digit to the right of the underlined number, 3. if the number is 5 or greater round up, if the digit is less than 5 leave the underlined digit the same. 3. fill digits to right of rounded number with zeroes |
| ordered pairs | Example (3, 2) first number is x (3), SECOND number is y (2). |
| y axis | the vertical axis - goes up and down |
| x axis | horizontal - goes across |
| change fraction to decimal | divide numerator by denominator |
| change decimal to fraction | read decimal and write as fraction |
