Mathematics Knowledge

Same signs give a positive result; different signs give a negative result. So (−)(−)=+, (+)(+)=+, (−)(+)=−.

Subtract the smaller absolute value from the larger, then keep the sign of the number with the larger absolute value. Example: −9 + 5 = −4.

Subtracting a negative is the same as adding a positive: a − (−b) = a + b. Example: 8 − (−3) = 11.

Parentheses, Exponents, Multiplication and Division (left to right), Addition and Subtraction (left to right).

Exponent first: 2² = 4. Then multiply: 4 × 4 = 16. Then add: 3 + 16 = 19.

A factor divides evenly into the number (factors of 12: 1,2,3,4,6,12). A multiple is the number times an integer (multiples of 12: 12,24,36...).