3-45. 276 students
3-46. See below:
a.
b.
c.
d.
36%
8%
17%
110%
3-47. See below:
a. 30 liters
b. 42 liters
c. 24 liters
3-48. See below:
a.
Answers vary:
and
,
and
, and
and
have the same
denominator;
,
,
,
, and
have
denominators that are easy multiples of each other; students may identify
fractions that they can add together mentally, such as
may recognize that
fraction or sum.
3-49. See below:
a. $7.75 · 12 = $93
3-50. See below:
a. 7%
b.
or
c.
or
d. 0.315
,
; students
is equal to 1 and thus can be added easily to any other
3-51. See below:
a. 0.7 is larger than 18%, explanations will vary.
3-52. See below:
a. Drawings will vary, but the students should recognize that 78 squares and
another should be shaded, 0.785.
of
3-53. See below:
a. 2. See possible diagram below.
3-54. See below:
a. He does not have enough money, all of the items would cost $11.69. He could
buy either the ketchup, which would cost $9.80, or the mustard, which would
cost $9.00.