Evidence and Missing Information Worksheet

Critical thinking lesson 9: Enough evidence and missing information · Set 411 · 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.🥭 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, mangoes match (c) no mango is sweet (d) yes, it is certain
2. 2.🧩 The film starts at 4 PM and lasts 1 hour. When does it end? (a) 5 PM (b) 4 PM (c) not enough info (d) 6 PM
3. 3.🧩 Diya bought 4 mangoes for ₹100 in all. Each mango cost the same. What did one mango cost? (a) ₹25 (b) not enough info (c) ₹100 (d) ₹30
4. 4.🧩 Arjun bought 2 pens and a bag for ₹110 in all. Each pen cost the same. What did one pen cost? (a) not enough info (b) ₹108 (c) ₹110 (d) ₹55
5. 5.🧩 A box of apples has 9 in each row. How many apples are in the box? (a) 9 (b) 18 (c) not enough info (d) 90
6. 6.🧩 Diya bought 5 mangoes for ₹300 in all. Each mango cost the same. What did one mango cost? (a) not enough info (b) ₹60 (c) ₹300 (d) ₹65
7. 7.🧩 Diya is 9 years old. Ananya is older than Diya. How old is Ananya? (a) not enough info (b) 11 (c) 10 (d) 14
8. 8.True or false: “One mango in the box was sour, so all the mangoes are sour.” does not give enough evidence. (a) True (b) False
9. 9.🧩 Rohan is 12 years old. Ishaan is older than Rohan. How old is Ishaan? (a) 17 (b) 13 (c) not enough info (d) 14
10. 10.🧩 Saanvi bought 4 notebooks and a water bottle for ₹100 in all. Each notebook cost the same. What did one notebook cost? (a) ₹96 (b) ₹100 (c) not enough info (d) ₹25
11. 11.🔬 Why do scientists repeat an experiment? (a) to change answers (b) to be sure of results (c) to waste time (d) for fun only
12. 12.🧩 A box has 4 rows of guavas, with 8 in each row. How many guavas are in the box? (a) 40 (b) not enough info (c) 12 (d) 32
13. 13.True or false: “We tried the new route for 10 days, and it was faster every day.” does not give enough evidence. (a) True (b) False
14. 14.True or false: “We checked all 40 mangoes in the box; every one was ripe.” gives enough evidence. (a) False (b) True
15. 15.🧩 Meera bought 5 pens for ₹200 in all. Each pen cost the same. What did one pen cost? (a) not enough info (b) ₹45 (c) ₹40 (d) ₹200
16. 16.🧩 A box of apples has 5 in each row. How many apples are in the box? (a) 10 (b) 50 (c) not enough info (d) 5
17. 17.📊 Which gives the best evidence about the class’s favourite game? (a) guessing (b) asking one friend (c) asking your pet (d) asking the whole class
18. 18.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
19. 19.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
20. 20.True or false: “My friend didn’t like the book, so the book is bad for everyone.” gives enough evidence. (a) True (b) False
21. 21.🧩 A box of laddoos has 5 in each row. How many laddoos are in the box? (a) not enough info (b) 50 (c) 5 (d) 10
22. 22.True or false: “We tested 20 seeds, and 18 of them sprouted.” does not give enough evidence. (a) False (b) True
23. 23.🧩 Enough evidence or not? “A dog barked at me once, so all dogs are mean.” (a) not enough evidence (b) enough evidence
24. 24.True or false: “We tried the new route for 10 days, and it was faster every day.” gives enough evidence. (a) False (b) True
25. 25.🧩 A box has 6 rows of apples, with 7 in each row. How many apples are in the box? (a) 49 (b) 42 (c) 13 (d) not enough info
26. 26.🧩 A box of guavas has 8 in each row. How many guavas are in the box? (a) 80 (b) 8 (c) not enough info (d) 16
27. 27.🧩 Enough evidence or not? “We tested 20 seeds, and 18 of them sprouted.” (a) enough evidence (b) not enough evidence
28. 28.🧩 Enough evidence or not? “It rained on my birthday once, so it always rains on birthdays.” (a) enough evidence (b) not enough evidence
29. 29.🧩 A box has 8 rows of laddoos, with 5 in each row. How many laddoos are in the box? (a) 45 (b) 40 (c) not enough info (d) 13
30. 30.🧩 Enough evidence or not? “One student said the canteen food was cold, so it is always cold.” (a) not enough evidence (b) enough evidence
31. 31.🧩 Meera bought 2 markers and a cap for ₹150 in all. Each marker cost the same. What did one marker cost? (a) ₹150 (b) not enough info (c) ₹148 (d) ₹75
32. 32.🧩 Saanvi is 11 years old. Aarav is older than Saanvi. How old is Aarav? (a) 12 (b) not enough info (c) 13 (d) 16
33. 33.🧩 Enough evidence or not? “We measured the plant every day for a month; it grew 9 cm.” (a) enough evidence (b) not enough evidence
34. 34.🧩 A box of apples has 7 in each row. How many apples are in the box? (a) 70 (b) 7 (c) 14 (d) not enough info
35. 35.🧩 Rohan is 12 years old. Vihaan is 2 years older than Rohan. How old is Vihaan? (a) 2 (b) not enough info (c) 14 (d) 15
36. 36.🧩 The film starts at 4 PM and lasts 3 hours. When does it end? (a) 7 PM (b) 8 PM (c) 4 PM (d) not enough info
37. 37.🧩 Enough evidence or not? “We tried the new route for 10 days, and it was faster every day.” (a) not enough evidence (b) enough evidence
38. 38.🧩 Nisha bought 2 markers and a water bottle for ₹160 in all. Each marker cost the same. What did one marker cost? (a) ₹158 (b) ₹80 (c) not enough info (d) ₹160
39. 39.🧩 Meera bought 3 kites for ₹150 in all. Each kite cost the same. What did one kite cost? (a) not enough info (b) ₹50 (c) ₹150 (d) ₹55
40. 40.🧩 Enough evidence or not? “We checked all 40 mangoes in the box; every one was ripe.” (a) enough evidence (b) not enough evidence

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