Evidence and Missing Information Worksheet

Critical thinking lesson 9: Enough evidence and missing information · Set 900 · 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.🧩 Before solving a word problem, first check… (a) the colour of ink (b) the page number (c) your handwriting (d) what facts are given
2. 2.🧩 Enough evidence or not? “One student said the canteen food was cold, so it is always cold.” (a) enough evidence (b) not enough evidence
3. 3.🧩 Enough evidence or not? “One mango in the box was sour, so all the mangoes are sour.” (a) enough evidence (b) not enough evidence
4. 4.🥭 You taste one mango from a box of 50, and it is sweet. Can you be sure all 50 are sweet? (a) no mango is sweet (b) yes, mangoes match (c) no, check more (d) yes, it is certain
5. 5.🧩 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
6. 6.🧩 The film starts at 4 PM and lasts 1 hour. When does it end? (a) 5 PM (b) 4 PM (c) 6 PM (d) not enough info
7. 7.🧩 Nisha bought 2 balls for ₹80 in all. Each ball cost the same. What did one ball cost? (a) ₹45 (b) not enough info (c) ₹80 (d) ₹40
8. 8.🧩 A box has 5 rows of guavas, with 5 in each row. How many guavas are in the box? (a) 30 (b) not enough info (c) 10 (d) 25
9. 9.🧩 Aarav is 11 years old. Kabir is 7 years older than Aarav. How old is Kabir? (a) 18 (b) 19 (c) not enough info (d) 7
10. 10.True or false: “A dog barked at me once, so all dogs are mean.” does not give enough evidence. (a) False (b) True
11. 11.🐕 One dog barked at you. What is the fair conclusion? (a) never see dogs (b) that one dog barked (c) all dogs are mean (d) dogs hate you
12. 12.🧩 Enough evidence or not? “A dog barked at me once, so all dogs are mean.” (a) enough evidence (b) not enough evidence
13. 13.🧩 The film starts at 6 PM and lasts 2 hours. When does it end? (a) 6 PM (b) not enough info (c) 9 PM (d) 8 PM
14. 14.True or false: “One mango in the box was sour, so all the mangoes are sour.” gives enough evidence. (a) False (b) True
15. 15.🧩 The film starts at 2 PM. It is a long film. When does it end? (a) not enough info (b) 4 PM (c) 5 PM (d) 3 PM
16. 16.🔬 Why do scientists repeat an experiment? (a) to change answers (b) to be sure of results (c) to waste time (d) for fun only
17. 17.🧩 Enough evidence or not? “We tested 20 seeds, and 18 of them sprouted.” (a) not enough evidence (b) enough evidence
18. 18.🧩 Ishaan bought 6 pens and a water bottle for ₹100 in all. Each pen cost the same. What did one pen cost? (a) ₹100 (b) not enough info (c) ₹94 (d) ₹16
19. 19.🧩 A box of guavas has 5 in each row. How many guavas are in the box? (a) 10 (b) 50 (c) not enough info (d) 5
20. 20.True or false: “We checked all 40 mangoes in the box; every one was ripe.” gives enough evidence. (a) False (b) True
21. 21.True or false: “We measured the plant every day for a month; it grew 9 cm.” does not give enough evidence. (a) True (b) False
22. 22.📊 Which gives the best evidence about the class’s favourite game? (a) asking the whole class (b) asking one friend (c) guessing (d) asking your pet
23. 23.🧩 Enough evidence or not? “We asked all 30 classmates; 25 chose the zoo trip.” (a) not enough evidence (b) enough evidence
24. 24.📝 What does “evidence” mean? (a) a loud opinion (b) a guess (c) facts that support it (d) a rumour
25. 25.🧩 Ishaan is 11 years old. Nisha is 8 years older than Ishaan. How old is Nisha? (a) not enough info (b) 19 (c) 8 (d) 20
26. 26.🧩 A box of mangoes has 6 in each row. How many mangoes are in the box? (a) 12 (b) not enough info (c) 60 (d) 6
27. 27.🧩 A box of apples has 4 in each row. How many apples are in the box? (a) 4 (b) 40 (c) 8 (d) not enough info
28. 28.🧩 Ananya bought 6 notebooks for ₹300 in all. Each notebook cost the same. What did one notebook cost? (a) ₹300 (b) ₹55 (c) ₹50 (d) not enough info
29. 29.🧩 Meera is 7 years old. Arjun is 2 years older than Meera. How old is Arjun? (a) 10 (b) 2 (c) 9 (d) not enough info
30. 30.🧩 The film starts at 4 PM. It is a long film. When does it end? (a) not enough info (b) 6 PM (c) 5 PM (d) 7 PM
31. 31.🧩 Aarav bought 6 balls and a bag for ₹150 in all. Each ball cost the same. What did one ball cost? (a) ₹150 (b) ₹144 (c) not enough info (d) ₹25
32. 32.🧩 Enough evidence or not? “We checked all 40 mangoes in the box; every one was ripe.” (a) not enough evidence (b) enough evidence
33. 33.🧩 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
34. 34.🧩 Rohan is 9 years old. Vihaan is older than Rohan. How old is Vihaan? (a) 14 (b) 10 (c) not enough info (d) 11
35. 35.🧩 Ananya is 12 years old. Meera is older than Ananya. How old is Meera? (a) 14 (b) 13 (c) not enough info (d) 17
36. 36.🧩 The film starts at 3 PM. It is a long film. When does it end? (a) 5 PM (b) 4 PM (c) not enough info (d) 6 PM
37. 37.True or false: “One student said the canteen food was cold, so it is always cold.” gives enough evidence. (a) False (b) True
38. 38.True or false: “We tested 20 seeds, and 18 of them sprouted.” gives enough evidence. (a) False (b) True
39. 39.🧩 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
40. 40.True or false: “It rained on my birthday once, so it always rains on birthdays.” gives enough evidence. (a) True (b) False

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