Evidence and Missing Information Worksheet

Critical thinking lesson 9: Enough evidence and missing information · Set 630 · 40 questions

Thinking tip (Enough facts, then decide): Not enough evidence: “One mango was sour, so all are sour.” Enough: “We checked all 40 mangoes; every one was ripe.” Before you answer, check every fact you need is given. 7 rows with 9 in each → 7 × 9 = 63. “A box has 9 in each row” with no number of rows → not enough info. Missing facts hide in words like “and a bag”, “older” (by how much?) and “a long film” (how long?).

1. 1.True or false: “We measured the plant every day for a month; it grew 9 cm.” gives enough evidence. (a) True (b) False
2. 2.🧩 Enough evidence or not? “It rained on my birthday once, so it always rains on birthdays.” (a) not enough evidence (b) enough evidence
3. 3.🧩 Arjun bought 3 mangoes for ₹105 in all. Each mango cost the same. What did one mango cost? (a) not enough info (b) ₹105 (c) ₹35 (d) ₹40
4. 4.🧩 The film starts at 2 PM and lasts 2 hours. When does it end? (a) 2 PM (b) not enough info (c) 5 PM (d) 4 PM
5. 5.🧩 Enough evidence or not? “We checked all 40 mangoes in the box; every one was ripe.” (a) not enough evidence (b) enough evidence
6. 6.🧩 Kabir is 12 years old. Vihaan is 3 years older than Kabir. How old is Vihaan? (a) 16 (b) 15 (c) 3 (d) not enough info
7. 7.🧩 Enough evidence or not? “A dog barked at me once, so all dogs are mean.” (a) not enough evidence (b) enough evidence
8. 8.🧩 Meera is 11 years old. Vihaan is 4 years older than Meera. How old is Vihaan? (a) 15 (b) not enough info (c) 16 (d) 4
9. 9.🧩 Tara bought 2 mangoes and a water bottle for ₹100 in all. Each mango cost the same. What did one mango cost? (a) ₹100 (b) not enough info (c) ₹98 (d) ₹50
10. 10.🧩 Saanvi bought 2 balls and a lunch box for ₹120 in all. Each ball cost the same. What did one ball cost? (a) not enough info (b) ₹120 (c) ₹118 (d) ₹60
11. 11.🧩 Aarav is 9 years old. Diya is 3 years older than Aarav. How old is Diya? (a) 13 (b) not enough info (c) 3 (d) 12
12. 12.🔬 Why do scientists repeat an experiment? (a) to change answers (b) to waste time (c) for fun only (d) to be sure of results
13. 13.🧩 Nisha bought 6 mangoes and a cap for ₹210 in all. Each mango cost the same. What did one mango cost? (a) ₹204 (b) not enough info (c) ₹210 (d) ₹35
14. 14.🐕 One dog barked at you. What is the fair conclusion? (a) all dogs are mean (b) never see dogs (c) that one dog barked (d) dogs hate you
15. 15.🧩 A box of eggs has 5 in each row. How many eggs are in the box? (a) not enough info (b) 5 (c) 10 (d) 50
16. 16.🧩 Diya bought 2 markers for ₹90 in all. Each marker cost the same. What did one marker cost? (a) ₹50 (b) ₹45 (c) ₹90 (d) not enough info
17. 17.🧩 Aarav is 9 years old. Saanvi is older than Aarav. How old is Saanvi? (a) 10 (b) 11 (c) not enough info (d) 14
18. 18.🧩 Enough evidence or not? “We measured the plant every day for a month; it grew 9 cm.” (a) enough evidence (b) not enough evidence
19. 19.🧩 The film starts at 3 PM and lasts 1 hour. When does it end? (a) not enough info (b) 5 PM (c) 4 PM (d) 3 PM
20. 20.🧩 A box of laddoos has 6 in each row. How many laddoos are in the box? (a) 12 (b) 6 (c) 60 (d) not enough info
21. 21.🧩 Enough evidence or not? “We tried the new route for 10 days, and it was faster every day.” (a) enough evidence (b) not enough evidence
22. 22.🧩 A box of apples has 9 in each row. How many apples are in the box? (a) not enough info (b) 90 (c) 9 (d) 18
23. 23.🧩 Kabir bought 2 pens and a lunch box for ₹100 in all. Each pen cost the same. What did one pen cost? (a) ₹98 (b) not enough info (c) ₹50 (d) ₹100
24. 24.🧩 The film starts at 5 PM and lasts 2 hours. When does it end? (a) 5 PM (b) 8 PM (c) not enough info (d) 7 PM
25. 25.🧩 Kabir is 10 years old. Arjun is 2 years older than Kabir. How old is Arjun? (a) 2 (b) not enough info (c) 12 (d) 13
26. 26.True or false: “My friend didn’t like the book, so the book is bad for everyone.” does not give enough evidence. (a) True (b) False
27. 27.🧩 A box of laddoos has 7 in each row. How many laddoos are in the box? (a) 14 (b) 7 (c) 70 (d) not enough info
28. 28.🥭 You taste one mango from a box of 50, and it is sweet. Can you be sure all 50 are sweet? (a) yes, it is certain (b) no mango is sweet (c) yes, mangoes match (d) no, check more
29. 29.📊 Which gives the best evidence about the class’s favourite game? (a) asking one friend (b) guessing (c) asking the whole class (d) asking your pet
30. 30.🧩 Enough evidence or not? “My friend didn’t like the book, so the book is bad for everyone.” (a) enough evidence (b) not enough evidence
31. 31.🧩 Enough evidence or not? “We tested 20 seeds, and 18 of them sprouted.” (a) enough evidence (b) not enough evidence
32. 32.🧩 Aarav is 6 years old. Vihaan is 2 years older than Aarav. How old is Vihaan? (a) 8 (b) 2 (c) 9 (d) not enough info
33. 33.🧩 The film starts at 3 PM. It is a long film. When does it end? (a) not enough info (b) 5 PM (c) 6 PM (d) 4 PM
34. 34.🧩 Ananya bought 4 mangoes and a lunch box for ₹140 in all. Each mango cost the same. What did one mango cost? (a) not enough info (b) ₹136 (c) ₹35 (d) ₹140
35. 35.True or false: “A dog barked at me once, so all dogs are mean.” gives enough evidence. (a) False (b) True
36. 36.True or false: “A dog barked at me once, so all dogs are mean.” does not give enough evidence. (a) True (b) False
37. 37.True or false: “We asked all 30 classmates; 25 chose the zoo trip.” gives enough evidence. (a) False (b) True
38. 38.True or false: “One mango in the box was sour, so all the mangoes are sour.” gives enough evidence. (a) False (b) True
39. 39.True or false: “We asked all 30 classmates; 25 chose the zoo trip.” does not give enough evidence. (a) True (b) False
40. 40.🧩 A box of mangoes has 8 in each row. How many mangoes are in the box? (a) not enough info (b) 8 (c) 16 (d) 80

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