Number Puzzles Worksheet

Logical reasoning lesson 27: Number puzzles · Set 449 · 40 questions

How to think it through (Clues into sums): Magic square: find the total from a full row, column or diagonal, then fill the gap. Digits that add to S and differ by D: the bigger digit is (S + D) ÷ 2. Three consecutive numbers: the middle one is the sum ÷ 3.

1. 1.I am a 2-digit number. My digits add up to 3 and my tens digit is 3 more than my ones digit. What number am I?
2. 2.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
   6 | 20 | ?
   16 | 12 | 8
   14 | 4 | 18
3. 3.I am a 2-digit number. My digits add up to 17. If you swap my two digits, the new number is 9 more than me. What number am I?
4. 4.The sum of three consecutive numbers is 177. What is the largest of them?
5. 5.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
   20 | 5 | 26
   23 | 17 | ?
   8 | 29 | 14
6. 6.I am a 2-digit number. My digits add up to 11. If you swap my two digits, the new number is 9 more than me. What number am I?
7. 7.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
   12 | 7 | 8
   ? | 9 | 13
   10 | 11 | 6
8. 8.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
   26 | ? | 20
   11 | 17 | 23
   14 | 29 | 8
9. 9.The sum of three consecutive even numbers is 126. What is the largest of them?
10. 10.The sum of three consecutive even numbers is 42. What is the smallest of them?
11. 11.I am a 2-digit number. My digits add up to 11. If you swap my two digits, the new number is 63 more than me. What number am I?
12. 12.I am a 2-digit number. My digits add up to 8 and my tens digit is 6 more than my ones digit. What number am I?
13. 13.I am a 2-digit number. My digits add up to 12. If you swap my two digits, the new number is 18 more than me. What number am I?
14. 14.The sum of three consecutive numbers is 72. What is the smallest of them?
15. 15.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
    11 | 25 | 15
    21 | 17 | 13
    19 | 9 | ?
16. 16.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
    7 | ? | 3
    2 | 6 | 10
    9 | 4 | 5
17. 17.I am a 2-digit number. My digits add up to 7 and my tens digit is 5 more than my ones digit. What number am I?
18. 18.I am a 2-digit number. My digits add up to 4 and my tens digit is 2 more than my ones digit. What number am I?
19. 19.I am a 2-digit number. My digits add up to 13 and my tens digit is 3 more than my ones digit. What number am I?
20. 20.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
    17 | 10 | 15
    12 | ? | 16
    13 | 18 | 11
21. 21.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
    10 | 15 | ?
    17 | 13 | 9
    12 | 11 | 16
22. 22.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
    19 | 4 | 25
    22 | 16 | 10
    7 | 28 | ?
23. 23.The sum of three consecutive numbers is 171. What is the smallest of them?
24. 24.I am a 2-digit number. My digits add up to 4. If you swap my two digits, the new number is 18 more than me. What number am I?
25. 25.I am a 2-digit number. My digits add up to 8 and my tens digit is 4 more than my ones digit. What number am I?
26. 26.The sum of three consecutive even numbers is 204. What is the largest of them?
27. 27.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
    6 | 5 | 10
    11 | 7 | 3
    ? | 9 | 8
28. 28.The sum of three consecutive even numbers is 174. What is the largest of them?
29. 29.The sum of three consecutive even numbers is 66. What is the largest of them?
30. 30.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
    13 | 8 | 15
    14 | 12 | 10
    9 | ? | 11
31. 31.I am a 2-digit number. My digits add up to 9 and my tens digit is 1 more than my ones digit. What number am I?
32. 32.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
    23 | 26 | 11
    8 | 20 | 32
    29 | ? | 17
33. 33.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
    25 | ? | 17
    11 | 19 | 27
    21 | 23 | 13
34. 34.The sum of three consecutive even numbers is 144. What is the largest of them?
35. 35.I am a 2-digit number. My digits add up to 17 and my tens digit is 1 more than my ones digit. What number am I?
36. 36.The sum of three consecutive numbers is 30. What is the smallest of them?
37. 37.In this magic square every row, column and diagonal adds up to the same total. Find the missing number.
    16 | 14 | 24
    26 | 18 | 10
    12 | ? | 20
38. 38.I am a 2-digit number. My digits add up to 6 and my tens digit is 2 more than my ones digit. What number am I?
39. 39.I am a 2-digit number. My digits add up to 11. If you swap my two digits, the new number is 45 more than me. What number am I?
40. 40.The sum of three consecutive even numbers is 90. What is the largest of them?

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