## Test your basic knowledge |

# Important Math Facts

**Instructions:**

- Answer 50 questions in 15 minutes.
- If you are not ready to take this test, you can study here.
- Match each statement with the correct term.
- Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

**1. Two angles are ___________ if the sum of their measures is 90°.**

**2. The symbol < is read as ________ .**

**3. An ________ is a mathematical sentence that contains the equal sign.**

**4. To ___________ - multiply the numerators and then multiply the denominators. Write the product in lowest terms.**

**5. The symbol ______ means percent.**

**6. ___________ is a number that can be written using an exponent. For example - 3² means three to the second power.**

**7. Prime factorization can be written using ________ . For example - 2 x 2 x 3 = 2² x 3**

**8. The ___________ of a circle is equal to π times its diameter or π times twice its radius. C = π d or C = 2 π r.**

**9. The symbol ≥ is read as ______________.**

**10. The ______________ are the numbers of pieces of data that can represent the whole set of data. These common measures of central tendency are mean - median - and mode.**

**11. To express a ______ as ________a - express the percent as a fraction with a denominator of 100 - then simplify.**

**12. ______________ are two events in which either one or the other must take place - but they cannot both happen at the same time. The sum of their probabilities is one.**

**13. The set of all possible outcomes is _____________.**

**14. The surface area of a __________ is the sum of the areas of two circles and a rectangle.**

**15. A _________ has six rectangular faces. To find the surface area - find the sum of the areas of the six faces.**

**16. Both addition and multiplication are __________ . This means that grouping addends or factors will not change the sum or product.**

**17. An ___________ is a combination of numbers - variables - and operations.**

**18. Together - the x coordinate and y coordinate form an ___________.**

**19. To _________ - write the mixed numbers as improper fractions. Replace the divisor with its reciprocal and multiply.**

**20. A ___________ is a transformation that turns a line or shape around a fixed point.**

**21. _________ - _________ - and_______may be written by first writing each one as a fraction with a denominator of 100.**

**22. A _________ is an equation that shows two ratios are equivalent.**

**23. A _______ is a ratio that compares a number to 100.**

**24. A _________ is a randomly-selected group that is used to represent a whole population.**

**25. A _______ is a comparison of two numbers with different units of measure.**

**26. A diagram used to show the total number of possible outcomes in a probability experiment is called a _____________.**

**27. To add mixed numbers with unlike denominators - write equivalent fractions with a ___________ . Add the whole numbers and add the fractions.**

**28. The symbol > is read as _________.**

**29. A _________ is a special kind of bar graph that shows frequency of data.**

**30. To add or subtract fractions with unlike denominators - you need to change the fractions to equivalent fractions with ____________ before you find the sum or difference.**

**31. Similar figures have the same shape but different sizes. The symbol ~ means _________ .**

**32. Use __________ to compare two decimals - using the order symbols.**

**33. Both addition and multiplication are _________ . This means that order doesnÂft change the sum or product.**

**34. To _____________ - express the mixed numbers as improper fractions - multiply - and simplify the results.**

**35. A figure that can be rotated 180° about a point so that it matches the original figure has ______ .**

**36. In a __________ - an object slides from one position to another without changing its size or shape.**

**37. To express a ______ as a _______ - rewrite the percent as a fraction with a denominator of 100 - and then express the fraction as a decimal.**

**38. An _________ is a mathematical sentence that contains < - > - - ≤ - or ≥ .**

**39. In a power - the number of times the base is used as a factor is the ________ . In 5³ - the exponent is 3.**

**40. In a power - the number used as a factor is the base. In 10³ - the ________ is 10. That is - 10³ = 10 X 10 X 10.**

**41. An approximation of pi is 3.14 - or _______ .**

**42. Make a __________ of an integer by using its placement on the number line.**

**43. The __________ of a solid is the total area of its exterior surfaces.**

**44. When two or more numbers are multiplied - each number is called a _________ .**

**45. The ________ is used to represent the ratio of distance on the map to the actual distance.**

**46. To __________ an algebraic expression means to substitute a value for the variables and apply the rules for order of operation.**

**47. To ______________ - if the denominators are unlike - write equivalent fractions with a common denominator. Subtract the fractions first - and rename if necessary. Then subtract the whole numbers. Simplify if possible.**

**48. A _______ is the comparison of two numbers by division.**

**49. The line or the fold is called the __________ .**

**50. The symbol ≤ is read as __________ .**