UST Elementary Daily Math Challenge
Week 8 — Organizing Information
October 5–11, 2026
50 Problems • Grades 3–5 Focus
A little math every day. A little stronger every week.
Weekly Format
每天完成一小部分；周末完成 Challenge
2
Monday: Questions 1–10
Tuesday: Questions 11–20
Wednesday: Questions 21–30
Thursday: Questions 31–40
Friday / Weekend: Questions 41–50 + Challenge
Goal: Think first, calculate second, and explain your reasoning.
Daily Practice
Questions 1–5
3
1. A table shows Monday=11 books and Tuesday=9 books. How many books altogether? A) 20 B) 2 C) 99 D) 11
2. A table shows Monday=12 books and Tuesday=10 books. How many books altogether? A) 22 B) 2 C) 120 D) 12
3. A table shows Monday=13 books and Tuesday=11 books. How many books altogether? A) 24 B) 2 C) 143 D) 13
4. A table shows Monday=14 books and Tuesday=12 books. How many books altogether? A) 26 B) 2 C) 168 D) 14
5. A table shows Monday=15 books and Tuesday=13 books. How many books altogether? A) 28 B) 2 C) 195 D) 15
Daily Practice
Questions 6–10
4
6. A table shows Monday=16 books and Tuesday=14 books. How many books altogether? A) 30 B) 2 C) 224 D) 16
7. A table shows Monday=17 books and Tuesday=15 books. How many books altogether? A) 32 B) 2 C) 255 D) 17
8. A table shows Monday=18 books and Tuesday=16 books. How many books altogether? A) 34 B) 2 C) 288 D) 18
9. A table shows Monday=19 books and Tuesday=17 books. How many books altogether? A) 36 B) 2 C) 323 D) 19
10. A table shows Monday=20 books and Tuesday=18 books. How many books altogether? A) 38 B) 2 C) 360 D) 20
Daily Practice
Questions 11–15
5
11. A table shows Monday=21 books and Tuesday=19 books. How many books altogether? A) 40 B) 2 C) 399 D) 21
12. A table shows Monday=22 books and Tuesday=20 books. How many books altogether? A) 42 B) 2 C) 440 D) 22
13. A table shows Monday=23 books and Tuesday=21 books. How many books altogether? A) 44 B) 2 C) 483 D) 23
14. A table shows Monday=24 books and Tuesday=22 books. How many books altogether? A) 46 B) 2 C) 528 D) 24
15. A table shows Monday=25 books and Tuesday=23 books. How many books altogether? A) 48 B) 2 C) 575 D) 25
Daily Practice
Questions 16–20
6
16. The data are 16, 18, 20. The greatest value is ___.
17. The data are 17, 19, 21. The greatest value is ___.
18. The data are 18, 20, 22. The greatest value is ___.
19. The data are 19, 21, 23. The greatest value is ___.
20. The data are 20, 22, 24. The greatest value is ___.
Daily Practice
Questions 21–25
7
21. The data are 21, 23, 25. The greatest value is ___.
22. The data are 22, 24, 26. The greatest value is ___.
23. The data are 23, 25, 27. The greatest value is ___.
24. The data are 24, 26, 28. The greatest value is ___.
25. The data are 25, 27, 29. The greatest value is ___.
Daily Practice
Questions 26–30
8
26. The data are 26, 28, 30. The greatest value is ___.
27. The data are 27, 29, 31. The greatest value is ___.
28. The data are 28, 30, 32. The greatest value is ___.
29. The data are 29, 31, 33. The greatest value is ___.
30. The data are 30, 32, 34. The greatest value is ___.
Daily Practice
Questions 31–35
9
31. A survey: soccer=11, tennis=8, swimming=6. How many more chose soccer than swimming?
32. A survey: soccer=12, tennis=9, swimming=7. How many more chose soccer than swimming?
33. A survey: soccer=13, tennis=10, swimming=8. How many more chose soccer than swimming?
34. A survey: soccer=14, tennis=11, swimming=9. How many more chose soccer than swimming?
35. A survey: soccer=15, tennis=12, swimming=10. How many more chose soccer than swimming?
Daily Practice
Questions 36–40
10
36. A survey: soccer=16, tennis=13, swimming=11. How many more chose soccer than swimming?
37. A survey: soccer=17, tennis=14, swimming=12. How many more chose soccer than swimming?
38. A survey: soccer=18, tennis=15, swimming=13. How many more chose soccer than swimming?
39. A survey: soccer=19, tennis=16, swimming=14. How many more chose soccer than swimming?
40. A survey: soccer=20, tennis=17, swimming=15. How many more chose soccer than swimming?
Daily Practice
Questions 41–45
11
41. A survey: soccer=21, tennis=18, swimming=16. How many more chose soccer than swimming?
42. A survey: soccer=22, tennis=19, swimming=17. How many more chose soccer than swimming?
43. A survey: soccer=23, tennis=20, swimming=18. How many more chose soccer than swimming?
44. A survey: soccer=24, tennis=21, swimming=19. How many more chose soccer than swimming?
45. A survey: soccer=25, tennis=22, swimming=20. How many more chose soccer than swimming?
Weekly Challenge
Questions 46–50
12
46. Challenge: The four weekly scores are 4, 6, 8, 10. What is the average?
47. Challenge: The four weekly scores are 5, 7, 9, 11. What is the average?
48. Challenge: The four weekly scores are 6, 8, 10, 12. What is the average?
49. Challenge: The four weekly scores are 7, 9, 11, 13. What is the average?
50. Challenge: The four weekly scores are 8, 10, 12, 14. What is the average?
Answer Key — Questions 1–5
Answer + How to Solve
13
1. Answer: A
How to solve: Combine the two categories by addition.
2. Answer: A
How to solve: Combine the two categories by addition.
3. Answer: A
How to solve: Combine the two categories by addition.
4. Answer: A
How to solve: Combine the two categories by addition.
5. Answer: A
How to solve: Combine the two categories by addition.
Answer Key — Questions 6–10
Answer + How to Solve
14
6. Answer: A
How to solve: Combine the two categories by addition.
7. Answer: A
How to solve: Combine the two categories by addition.
8. Answer: A
How to solve: Combine the two categories by addition.
9. Answer: A
How to solve: Combine the two categories by addition.
10. Answer: A
How to solve: Combine the two categories by addition.
Answer Key — Questions 11–15
Answer + How to Solve
15
11. Answer: A
How to solve: Combine the two categories by addition.
12. Answer: A
How to solve: Combine the two categories by addition.
13. Answer: A
How to solve: Combine the two categories by addition.
14. Answer: A
How to solve: Combine the two categories by addition.
15. Answer: A
How to solve: Combine the two categories by addition.
Answer Key — Questions 16–20
Answer + How to Solve
16
16. Answer: 20
How to solve: Compare the values; the largest is the last number.
17. Answer: 21
How to solve: Compare the values; the largest is the last number.
18. Answer: 22
How to solve: Compare the values; the largest is the last number.
19. Answer: 23
How to solve: Compare the values; the largest is the last number.
20. Answer: 24
How to solve: Compare the values; the largest is the last number.
Answer Key — Questions 21–25
Answer + How to Solve
17
21. Answer: 25
How to solve: Compare the values; the largest is the last number.
22. Answer: 26
How to solve: Compare the values; the largest is the last number.
23. Answer: 27
How to solve: Compare the values; the largest is the last number.
24. Answer: 28
How to solve: Compare the values; the largest is the last number.
25. Answer: 29
How to solve: Compare the values; the largest is the last number.
Answer Key — Questions 26–30
Answer + How to Solve
18
26. Answer: 30
How to solve: Compare the values; the largest is the last number.
27. Answer: 31
How to solve: Compare the values; the largest is the last number.
28. Answer: 32
How to solve: Compare the values; the largest is the last number.
29. Answer: 33
How to solve: Compare the values; the largest is the last number.
30. Answer: 34
How to solve: Compare the values; the largest is the last number.
Answer Key — Questions 31–35
Answer + How to Solve
19
31. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
32. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
33. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
34. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
35. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
Answer Key — Questions 36–40
Answer + How to Solve
20
36. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
37. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
38. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
39. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
40. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
Answer Key — Questions 41–45
Answer + How to Solve
21
41. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
42. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
43. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
44. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
45. Answer: 5
How to solve: Subtract swimming from soccer: (10+n) − (5+n) = 5.
Answer Key — Questions 46–50
Answer + How to Solve
22
46. Answer: 7
How to solve: Add all four scores and divide by 4.
47. Answer: 8
How to solve: Add all four scores and divide by 4.
48. Answer: 9
How to solve: Add all four scores and divide by 4.
49. Answer: 10
How to solve: Add all four scores and divide by 4.
50. Answer: 11
How to solve: Add all four scores and divide by 4.
Week Complete!
Think • Reason • Solve • Explain