TrueFalse 21 All integers are rational numbers 22 If ab cd

True/False

21. All integers are rational numbers. _____

22. If a/b = c/d then a times c must be the same as b times d. _____

23. The natural number, 10103, is prime. _____

24. Integers are not dense, because there is no integer between six and seven. _____

25. The LCM for 48 and 72 is 288. _____

26. If 8 : x = 12 : 18 then x = 12. _____

27. All whole numbers are not counting numbers. _____

28. If b is any real number and m and n are natural numbers, then bm x bn = bm+n. _____

29. If b is any real number (b 0) and m and n are natural numbers, then bm/bn = bm-n. _____

30. The ratio of a to b can be written in any of the following forms: a b or a/b or a:b _____

31. In any proportion , the quotient of the means equals the difference of the extremes. _____

32. (3/5)% = (0.6)% = 0.06 = 6/100 = 3/50. _____

33. A percent markup on cost indicates the amount of the cost that goes to profit. _____

34. Subtraction of integers like, –8-(-3), is equivalent to addition of the opposite like, -8+3. _____

35. Markdown equals Original price plus Sale price. _____

36. The amount of money on which interest is paid is usually called the principal. _____

37. The formula to determine simple interest is: I = A - P _____

38. The amount (A) the borrower would have to pay for a loan is: A = P – I _____

39. An investment at 6% for 6 periods is less than the same investment at 4% for 8 periods. _____ 40. The GCD for 36 and 54 is 9. _____

41. Simplifying the expression: [-3^2 + (10 / -5) – 4] yields 3. _____

42. The simple interest on $5000 for 3 years @ 3.5% is $5250. _____

43. Simplifying the expression: [(3/8 + ¼) / (1/2 – 5/8)] yields 5. _____

44. A purse costs a wholesaler $40 and the markup is 40% of the cost. The selling price is 48. _____

45. A coat costs a retailer $54 and the markup is 40% of the selling price. The selling price is $90. _____

46. Not every whole number is a natural number. _____

47. Every integer is also a rational number. _____

48. An example of an irrational number is 0.25255255525555… . _____

49. As a quotient of two integers 2.15151515… is 71/33. _____

50. The counting number 43,859 is not prime.