Just Do It (mentally)
Math 367 – Math Teaching Methods
Day 1
Day 10
Day 2
Day 11
Day 3
Day 12
Day 4
Day 13
Day 5
Day 14
Day 6
Day 15
Day 7
Day 16
Day 8
Day 17
Day 9
Focusing on
Fractions, Decimals,
and Percents
J.R.Olsen ~ W.I.U.
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J.R.Olsen ~ W.I.U.
Day 1 Questions
Just Do It
(mentally)
Record your answers to the following in the Mental Math Section of your
notebook.
1. 10% of 650 is ___
2. 50% of 860 is ___
3. The regular price of a pair of jeans is $46. If they are on
sale for 50% off, what is the sale price?
1
4.    35
5
5. If one third of the sixth grade class of 120 students
exceeded state standards, how many sixth graders
exceeded state standards?
6. Solve: 10x = 43
Bonus: 70% of 80 = ___
J.R.Olsen ~ W.I.U.
Day 1 Answers
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Check your answers.
1. 65
2. 430
3. $23
4. 7
5. 40 sixth graders
6. 4.3
Bonus: 56
Website of the Day: Make a Match
J.R.Olsen ~ W.I.U.
Day 2 Questions
Just Do It
(mentally)
Record your answers to the following in the Mental Math Section of your
notebook.
7. One-eighth of 320 is ___
8. 12.5% of 40 is ___
3
9.    40
5
10.  3   80
8
11. If 37.5% of the teachers union, which has 160 members, is
against the proposal, how many are against the proposal?
12. What is the 10% tourism tax on a $65.00 ticket?
Bonus: 30% of 800 = ___
J.R.Olsen ~ W.I.U.
Day 2 Answers
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(mentally)
Check your answers.
7. 40
8. 5
9. 24
10. 30
11.60 teachers
12. tax is $6.50
Bonus: 240
Web site of the Day: Meteor Multiplication
J.R.Olsen ~ W.I.U.
Day 3 Questions
Record your answers in
your notebook.
Just Do It
(mentally)
13. If you get 25% more free and normally there are 20
ounces, how many ounces do you get?
14. 820  .25
15. Change to a fraction: 60%
3
16. 1 
5
17. If five-eighths of the cookie dough is used, how much is
left?
11
18. If 17 is the probability of winning, what is the probability of
losing?
Bonus: 75% of 820 is ___
J.R.Olsen ~ W.I.U.
Day 3 Answers
Check your answers.
Just Do It
(mentally)
13. 20 + 5 = 25 oz.
14. 205
6 3
15. 10  5
2
16.
5
17. Three-eighths
18. Six-seventeenths
Bonus: 615
Web site of the Day: Fresh Baked Fractions
J.R.Olsen ~ W.I.U.
Day 4 Questions
Record your answers in your
notebook.
Just Do It
(mentally)
19. If 30% of the school walks to school, what fraction is this?
20.Find 12% of 600.
21.If 23% of the 2,000 students in the district qualify for free
or reduced lunch, how many students qualify for free or
reduced lunch?
22.
5
1
14 of the construction paper is used up, what fraction
23. If 21/25
remains?
24. Find 12.5% of 56.
Bonus:
.03  130 = ___
J.R.Olsen ~ W.I.U.
Day 4 Answers
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(mentally)
Check your answers.
3
19.
10
20. 72
21. 460 students
9
22. 14
4
23. 25
24. 7
Bonus: 3.9
Web site of the Day: Jigsaw Puzzle
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Day 5 Questions
Record your answers in
your notebook.
Just Do It
(mentally)
1
25.  5   45
4
26.    45
5
27. What is the 5% tax on a $9 item?
28. Find the 15% tip on a bill of $16.00.
5
29.  8   72
 
30. If 87.5% of the students are present and enrollment is 800,
how many students are present?
Bonus: 110% of 800 is ___
J.R.Olsen ~ W.I.U.
Day 5 Answers
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(mentally)
Check your answers.
25. 9
26. 36
27. $0.45
28. $2.40
29. 45
30. 700 students present
Bonus: 880.
Web site of the Day: Find Grampy-Strict
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Day 6 Questions
Just Do It
(mentally)
Record your answers to the following in the Mental Math Section of your
notebook.
31. 10% of 5.63 = ___
32. Find the 20% tip on a bill of $32.00.
33. 25% of $40 = ___
34. 125% of $40 = ___
35. If the PTO is selling pizzas, which cost them $6, and they
want to make a 25% profit, how much should they charge
for a pizza?
36. Change to a mixed number: 150%
Bonus: Change to a mixed number: 280%
J.R.Olsen ~ W.I.U.
Day 6 Answers
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Check your answers.
31. .563
32. $6.40
33. $10
34. $50
35. $6 + $1.50 = $7.50
1
36. 1
2
Bonus:
4
2
5
Web site of the Day: Place Value Pirates
J.R.Olsen ~ W.I.U.
Day 7 Questions
Record your answers in
your notebook.
Just Do It
(mentally)
37. If you start with 5¾ cups of sugar and use 2½ cups, how
many are left over?
38.If you start with 14.7 liters and pour out 3.3 liters, how
much is left?
39.If you start with 200 kg and 15% is removed, how much is
left?
40.If you need to register 240 students and ¼ have already be
registered, how many still need to be registered?
41. 8,000,000  .125
42. 33⅓ % of 6,000 is ___
Bonus: 7/8  96 = 96  8  7 = 12  7 = 84
J.R.Olsen ~ W.I.U.
Day 7 Answers
Check your answers.
37.
Just Do It
(mentally)
3¼
38. 11.4 liters
39. 170 kg
40. 180 students
41. 1,000,000
42. 2,000
Bonus: Find the tip on an $82 bill.
Web site of the Day: Star Gazing
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Day 8 Questions
Record your answers in
your notebook.
Just Do It
(mentally)
43. 1% of 45.7 is ___
44. 0.01  5,000 = ___
45. 3% of 5,000 = ___
46. If 1% of the population of 3,000,000 got the H1N1 flu, how
many got the flu?
47. 110% of 50 = ___
48. If the sales tax is 5% and the cost of the shirt is $30, how
much do you have to pay?
Bonus: $8.20 + $4.10 = $12.30
J.R.Olsen ~ W.I.U.
Day 8 Answers
Check your answers.
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43. 4.57
44. 50
45. 150
46. 30,000
47. 5.5
48. $31.50
Bonus: Find the tip on an $82 bill.
Web site of the Day: Crack the Code
J.R.Olsen ~ W.I.U.
Day 9 Questions
Record your answers in
your notebook.
Just Do It
(mentally)
49. If 20% of the students were below standards on the
pretest, and there are 450 students, how many were below
standards?
50. Find 8% of 7,000.
51. If the item costs the store $50 and there is a 40% markup,
what will the retail price be?
52. $20.40 – $1.90 = ___ (Hint: use equal additions)
2 4
53. 5  1
5 5
54. If you start with 19.3 mL and use 5.8 mL, how much is
left?
Bonus: Change to a percent:
13
20
J.R.Olsen ~ W.I.U.
Day 9 Answers
Check your answers.
Just Do It
(mentally)
49. 90 students
50. 560.
51. $70
52. $20.40 – $1.90 = 20.50 – 2.00 = $18.50
53. 5 3  2  3 3
5
5
54.19.3 – 5.8 = 19.5 – 6 = 13.5 mL
Bonus: 65%
Web site of the Day:
Fishy Fractions – Equivalent Fractions
J.R.Olsen ~ W.I.U.
Day 10 Questions
Record your answers in
your notebook.
55. Change to a percent:
Just Do It
(mentally)
1
20
56. If three-twentieths of the school attended the game, what
percent attended the game?
57. Change to a fraction: 85%
58. If 35% of the solution is acid, what fraction is acid?
59. Change to a fraction: 66⅔ %
60. 66⅔ % of 12 = ___
Bonus: 75% of 52 = ___
J.R.Olsen ~ W.I.U.
Day 10 Answers
Check your answers.
Just Do It
(mentally)
55. 5%
56. 15%
17
57.
20
7
58.
20
2
59.
3
60. 8
Bonus: 39
Web site of the Day: Fishy Fractions - Adding
J.R.Olsen ~ W.I.U.
Day 11 Questions
Record your answers in
your notebook.
Just Do It
(mentally)
3
61.    350
5
4
62. If 7 of the frogs have red spots and there are 420 frogs,
how many have red spots?
63. Solve:
64. Solve:
65. Solve:
2
x  120
3
4
x  440
5
8
x  3, 200
5
66. 27% of 200 kg = ___
Bonus: 137.5% of 800 is __
J.R.Olsen ~ W.I.U.
Day 11 Answers
Check your answers.
Just Do It
(mentally)
61. 70  3 = 210
62. 60  4 = 240
3
x

120
   180
63.
2
5
64. 440  4   110(5)  550
5
65. 3, 200    400(5)  2, 000
8
66. 54 kg
Bonus: 1
3
of 800 is 1,100
8
Web site of the Day: Fishy Fractions - More
J.R.Olsen ~ W.I.U.
Day 12 Questions
Record your answers in
your notebook.
Just Do It
(mentally)
Find the shooting percentage of each player
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Day 12 Answers
Check your answers.
Just Do It
(mentally)
Web site of the Day: Mission Magnetite
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Day 13 Questions
Record your answers in
your notebook.
Just Do It
(mentally)
Estimate the shooting percentage of each player
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Day 13 Answers
Check your answers.
Just Do It
(mentally)
Web site of the Day: Bucky's Blueprints
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Day 14 Questions
Record your answers in
your notebook.
Just Do It
(mentally)
79. 1 – .27
80. If the poll shows 46% in favor, what percent is against?
81. If the probability of getting an ‘A’ is 29%, what is the
probability of not getting an ‘A’?
82. If 25.5% are incorrect, what percent are correct?
83. If 19.4% of the customers used a coupon, what percent
did not use a coupon?
84. If 37% of the shots were missed, what percent of the shot
scored?
Bonus: If 0.22% of the solution is a contaminant, what percent
is pure?
J.R.Olsen ~ W.I.U.
Day 14 Answers
Check your answers.
Just Do It
(mentally)
79. .73
80. 54%
81. 71%
82. 74.5%
83. 80.6%
84. 63%
Bonus: 99.78% pure
Web site of the Day: Sleuths on the Loose
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Day 15 Questions
Record your answers in
your notebook.
Just Do It
(mentally)
85. If the 24 oz. bottle of hand lotion is on special and you receive
33⅓% free, how many ounces should you receive?
86. The club has $670 to spend this year. They budget 10% for
supplies. How much is budgeted for supplies?
87. Three-fifths of the delegates favored the motion. If there are
55 delegates, how many favored the motion?
88. If the length is 1.2 cm and width is 3 cm, what is the area?
89. 75% of 96 = ___
90. Change to a percent:
Bonus: If 25% have inadequate3 health care and there are 2.4
million people, how many have
inadequate health care?
5
J.R.Olsen ~ W.I.U.
Day 15 Answers
Check your answers.
85.
86.
87.
88.
89.
90.
Just Do It
(mentally)
24 + 8 = 32 oz.
$67
33 delegates
3.6 cm²
72
60%
91. Bonus: .6 million = 600,000 people
Web site of the Day: Death to Decimals
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Day 16 Questions
Record your answers in
your notebook.
Just Do It
(mentally)
91. A piece of paper starts with a length of 11 inches. Fiveeighths of an inch are cut off. What is the new length?
92. 12% of 9,000 € = ___
93. If the length and width are 20 feet and 2.4 feet, what is the
area?
94. If the length and width are 20 feet and 2.4 feet, what is the
perimeter?
95. What is the 15% service charge on a purchase of $42.00?
96. If there were 300 members last year and this year there is a
20% increase, how many members are there this year?
Bonus: If Julie is 52 for 80, what is the shooting percentage?
J.R.Olsen ~ W.I.U.
Day 16 Answers
Check your answers.
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(mentally)
91. 10 and three-eighths inch.
92. 1,080 €
93. 48 sq. ft.
94. 44.8 ft.
95. $6.30
96. 360 members
Bonus: 52/80 = 13/20 = 65%
Web site of the Day: Fraction Pairs Game
J.R.Olsen ~ W.I.U.
Day 17 Questions
Record your answers in
your notebook.
Just Do It
(mentally)
97. A piece of paper starts with a width of 8½ inches. One
and seven-eighths of an inch are cut off. What is the new
width?
98. Jordan start with $13.20. He pays $4.90 for lunch. How
much does he have left?
99. If Geoff has 6 hits in 24 at-bats, what is his batting average
(convert to a 3-place decimal)?
100. 120% of 70 = ___
101. 0.1% of 80 = ___
102. 37.5% of 4,000 € = ___
Bonus: If 1 in 7 residents receive a property tax bill and there
are 109,200 residents, how many tax bills are there?
J.R.Olsen ~ W.I.U.
Day 17 Answers
Check your answers.
97. 6
5
inches
8
Just Do It
(mentally)
98. $8.30
99. .250
100. 84
101. 0.8
102. (3/8)4000 = 3500 = 1,500 €
Bonus: 15,600 tax bills
Web site of the Day:
Fraction (and percent) Four
Web site of the Day:
Balloon Invaders II
J.R.Olsen ~ W.I.U.