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Important Math Facts

Subject : math
  • Answer 50 questions in 15 minutes.
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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. A _______ is a ratio that compares a number to 100.

2. The _________ of an integer is the distance of the integer from zero.

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

4. When you add or subtract _________ that have the same or like denominators - you only add or subtract the numerators. The denominator stays the same.

5. Both addition and multiplication are _________ . This means that order doesnft change the sum or product.

6. 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.

7. Use number lines to ________ two decimals.

8. If a figure can be divided in half by a line so that the two halves match each other - the figure is __________ .

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

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

11. ______________ 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.

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

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

14. The _________ states that multiplying a sum by a number is the same as multiplying each addend by that number and then adding the two products. For example - 3(8 + 2) = (3 x 8) + (3 x 2).

15. The symbol < is read as ________ .

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

17. The _________ of a circle is twice the length of the radius.

18. The symbol ______ means percent.

19. A _____________ is a system used to condense a set of data where the greatest place value of the data forms the stem and next greatest place value forms the leaves.

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

21. Instead of writing large numbers with all the zeros - you can use _________ . For example - 4 -250 -000 -000 = 4.25 x 10⁹.

22. To add ____________ with common denominators - write the sum of the numerators over the common denominators. Then add the whole numbers.

23. 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.

24. The rules to follow when more than one operation is used are called the ___________.

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

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

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

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

29. An _________ is a mathematical sentence that contains < - > - ≠- ≤ - or ≥ .

30. The line or the fold is called the __________ .

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

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

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

34. Two angles are ___________ if the sum of their measures is 180°.

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

36. Together - the x coordinate and y coordinate form an ___________.

37. To ____________ - replace the divisor with its reciprocal and then multiply to get your answer.

38. An approximation of pi is 3.14 - or _______ .

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

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

41. 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.

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

43. The set of ________ consists of the positive whole numbers - zero - and the opposites of the positive whole numbers.

44. The set of all possible outcomes is _____________.

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

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

47. A _________ is a symbol - usually a letter - used to represent a number.

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

49. A ___________is for organizing a set of data that shows the number of times each item or number appears.

50. A ___________ is a proportion with one fraction with a denominator of 1.