1. Missing factor: an unknown factor in multiplication ex. 3 x ___ = 6
2. Meter: a metric unit used to measure long lengths. 1 meter = 100 cm or 40 inches
3. Century: a time period of 100 years.
4. Variable: a letter or symbol that stands for an unknown number. ex. 2 + m = ___
m = 3 than 2 +(m) = 2 + (3) = 5
5. Survey: a way to collect data to answer a question.
