Evidence and Missing Information Worksheet

Critical thinking lesson 9: Enough evidence and missing information · Set 717 · 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 tried the new route for 10 days, and it was faster every day.” does not give enough evidence. (a) False (b) True
2. 2.🔬 Why do scientists repeat an experiment? (a) to waste time (b) for fun only (c) to change answers (d) to be sure of results
3. 3.🧩 Kabir bought 5 kites and a bag for ₹265 in all. Each kite cost the same. What did one kite cost? (a) ₹265 (b) ₹53 (c) not enough info (d) ₹260
4. 4.🧩 Enough evidence or not? “It rained on my birthday once, so it always rains on birthdays.” (a) not enough evidence (b) enough evidence
5. 5.🧩 Enough evidence or not? “We tested 20 seeds, and 18 of them sprouted.” (a) enough evidence (b) not enough evidence
6. 6.🥭 You taste one mango from a box of 50, and it is sweet. Can you be sure all 50 are sweet? (a) no, check more (b) yes, it is certain (c) yes, mangoes match (d) no mango is sweet
7. 7.🧩 A box has 7 rows of laddoos, with 4 in each row. How many laddoos are in the box? (a) 32 (b) 28 (c) 11 (d) not enough info
8. 8.🧩 Arjun bought 3 mangoes for ₹135 in all. Each mango cost the same. What did one mango cost? (a) ₹50 (b) not enough info (c) ₹135 (d) ₹45
9. 9.🧩 Enough evidence or not? “My friend didn’t like the book, so the book is bad for everyone.” (a) not enough evidence (b) enough evidence
10. 10.True or false: “We tested 20 seeds, and 18 of them sprouted.” gives enough evidence. (a) False (b) True
11. 11.True or false: “A dog barked at me once, so all dogs are mean.” does not give enough evidence. (a) True (b) False
12. 12.True or false: “One mango in the box was sour, so all the mangoes are sour.” gives enough evidence. (a) False (b) True
13. 13.🧩 Aarav bought 5 notebooks for ₹225 in all. Each notebook cost the same. What did one notebook cost? (a) ₹45 (b) ₹225 (c) ₹50 (d) not enough info
14. 14.🧩 Meera is 6 years old. Arjun is older than Meera. How old is Arjun? (a) 8 (b) 11 (c) 7 (d) not enough info
15. 15.🧩 Enough evidence or not? “We checked all 40 mangoes in the box; every one was ripe.” (a) enough evidence (b) not enough evidence
16. 16.True or false: “One student said the canteen food was cold, so it is always cold.” does not give enough evidence. (a) True (b) False
17. 17.🧩 Vihaan bought 4 mangoes and a water bottle for ₹270 in all. Each mango cost the same. What did one mango cost? (a) ₹67 (b) ₹266 (c) not enough info (d) ₹270
18. 18.True or false: “It rained on my birthday once, so it always rains on birthdays.” gives enough evidence. (a) False (b) True
19. 19.🧩 Diya is 6 years old. Tara is 5 years older than Diya. How old is Tara? (a) 12 (b) 5 (c) 11 (d) not enough info
20. 20.🧩 A box of guavas has 6 in each row. How many guavas are in the box? (a) 6 (b) 12 (c) 60 (d) not enough info
21. 21.🧩 Diya bought 6 kites and a bag for ₹290 in all. Each kite cost the same. What did one kite cost? (a) ₹290 (b) not enough info (c) ₹48 (d) ₹284
22. 22.True or false: “We measured the plant every day for a month; it grew 9 cm.” does not give enough evidence. (a) False (b) True
23. 23.🧩 The film starts at 3 PM. It is a long film. When does it end? (a) 4 PM (b) 5 PM (c) 6 PM (d) not enough info
24. 24.🧩 The film starts at 4 PM. It is a long film. When does it end? (a) not enough info (b) 5 PM (c) 7 PM (d) 6 PM
25. 25.🧩 A box has 5 rows of guavas, with 5 in each row. How many guavas are in the box? (a) 25 (b) 10 (c) not enough info (d) 30
26. 26.🧩 The film starts at 2 PM and lasts 2 hours. When does it end? (a) 5 PM (b) not enough info (c) 4 PM (d) 2 PM
27. 27.🧩 Rohan is 12 years old. Aarav is 3 years older than Rohan. How old is Aarav? (a) not enough info (b) 16 (c) 3 (d) 15
28. 28.True or false: “My friend didn’t like the book, so the book is bad for everyone.” gives enough evidence. (a) True (b) False
29. 29.🧩 The film starts at 5 PM. It is a long film. When does it end? (a) 8 PM (b) 7 PM (c) not enough info (d) 6 PM
30. 30.🧩 A box has 4 rows of oranges, with 8 in each row. How many oranges are in the box? (a) not enough info (b) 40 (c) 12 (d) 32
31. 31.🧩 Aarav bought 4 notebooks for ₹100 in all. Each notebook cost the same. What did one notebook cost? (a) not enough info (b) ₹25 (c) ₹30 (d) ₹100
32. 32.🧩 Aarav bought 4 notebooks for ₹200 in all. Each notebook cost the same. What did one notebook cost? (a) ₹200 (b) not enough info (c) ₹55 (d) ₹50
33. 33.🧩 Diya bought 2 kites for ₹120 in all. Each kite cost the same. What did one kite cost? (a) not enough info (b) ₹120 (c) ₹65 (d) ₹60
34. 34.🧩 The film starts at 5 PM and lasts 1 hour. When does it end? (a) not enough info (b) 5 PM (c) 6 PM (d) 7 PM
35. 35.True or false: “One student said the canteen food was cold, so it is always cold.” gives enough evidence. (a) False (b) True
36. 36.🧩 Enough evidence or not? “We asked all 30 classmates; 25 chose the zoo trip.” (a) not enough evidence (b) enough evidence
37. 37.🧩 Kabir is 6 years old. Saanvi is 2 years older than Kabir. How old is Saanvi? (a) 2 (b) not enough info (c) 9 (d) 8
38. 38.🐕 One dog barked at you. What is the fair conclusion? (a) all dogs are mean (b) dogs hate you (c) that one dog barked (d) never see dogs
39. 39.True or false: “We checked all 40 mangoes in the box; every one was ripe.” does not give enough evidence. (a) True (b) False
40. 40.📊 Which gives the best evidence about the class’s favourite game? (a) asking your pet (b) asking the whole class (c) asking one friend (d) guessing

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