CBSE Class 4 Maths Sudoku Puzzle Worksheet

Holiday Homework - Class IV Mathematics

SUDOKU PUZZLES

Fill the blanks using numbers 1 to 4 (for the first three puzzles) 1 to 6 (for the last puzzle). Every row, column and inner box must contain all specified digits with no number repeated.

Question 1. Solve the first 4x4 Sudoku puzzle given on page 1.
Answer:

In simple words: Fill each 2x2 box, row, and column with numbers 1 to 4 without repeating any number.

Exam Tip: Start by looking at rows or 2x2 boxes that already have three numbers filled in to easily find the missing digit.

Question 2. Solve the second 4x4 Sudoku puzzle given on page 1.
Answer:

In simple words: Ensure digits 1 through 4 appear exactly once in every row, column, and 2x2 subgrid.

Exam Tip: Check intersections of rows and columns to eliminate impossible numbers.

Question 3. Solve the third 4x4 Sudoku puzzle given on page 1.
Answer:

In simple words: Place numbers 1 to 4 carefully so no row, column, or box has duplicates.

Exam Tip: Double check your completed grid by scanning each row and column from left to right and top to bottom.

Question 4. Solve the 6x6 Sudoku puzzle given on page 1.
Answer:

In simple words: Fill the 6x6 grid using numbers 1 to 6 without repeating in any row, column, or 2x3 box.

Exam Tip: For larger puzzles, pencil in candidate numbers lightly before finalizing.

SOLVE EACH BLOCK TO GET TO THE TOP

Question 5. Solve the step chain puzzle starting from the bottom block \(3 \times 1 = 3\) up to the top block.
Answer:
Step 1: Bottom block = \(3 \times 1 = 3\)
Step 2: Second block = \(3 \times 5 = 15\)
Step 3: Third block = \(15 - 3 = 12\)
Step 4: Fourth block = \(12 + 6 = 18\)
Step 5: Fifth block = \(18 \times 14 = 252\)
Step 6: Sixth block = \(252 + 7 = 259\)
Step 7: Seventh block = \(259 + 6 = 265\)
Step 8: Top block = \(265 \times 10 = 2650\)
In simple words: Follow the operations sequentially from bottom to top to find the final answer.

Exam Tip: Perform each arithmetic operation carefully and check intermediate results before moving to the next step.

Question 6. Add all columns and rows to fill in the blocks from page 11, and circle the greatest number that is summed up.
Answer:
Given matrix rows and columns are added. The maximum number present in the grid is 8.
Sum of row 1 = \(4 + 1 + 5 + 2 = 12\)
Sum of row 2 = \(6 + 1 + 1 + 5 = 13\)
Sum of row 3 = \(4 + 8 + 2 + 2 = 16\)
Sum of row 4 = \(3 + 3 + 1 + 0 = 7\)
Greatest number in the table = 8
In simple words: Calculate the sum for each row and column, and identify the highest single number in the table, which is 8.

Exam Tip: Read table rows carefully from left to right when calculating totals.

Question 7. Use addition and multiplication sign in each box to get an answer of 15.
Answer:
\(3 \times 3 + 6 = 15\)
\(7 + 2 \times 4 = 15\)
\(3 \times 4 + 3 = 15\)
\(5 \times 3 + 0 = 15\)
\(2 + 5 + 5 = 12\) (using appropriate operations to get 15: \(2 \times 5 + 5 = 15\))
\(8 + 1 \times 6 = 14\) (adjusted as \(8 + 1 \times 7\) or similar to reach 15, or check specific blanks: \(8 + 7 = 15\))
\(7 + 2 + 1 = 10\) (adjusted to reach 15: \(7 + 2 \times 4\) etc.)
In simple words: Insert plus and multiplication signs so that each expression evaluates to 15 following the order of operations.

Exam Tip: Always perform multiplication before addition when evaluating mixed operations.

Question 8. Add to the top (Pyramid Addition Puzzle): Given base numbers 4, 7, 3, 1. Fill the pyramid to the top.
Answer:
Base level: 4, 7, 3, 1
Level 2: \(4 + 7 = 11\), \(7 + 3 = 10\), \(3 + 1 = 4\)
Level 3: \(11 + 10 = 21\), \(10 + 4 = 14\)
Top level: \(21 + 14 = 35\)
In simple words: Add adjacent pairs of numbers in each row to get the number in the block directly above them.

Exam Tip: Verify each addition step horizontally across the pyramid rows.

Question 9. Subtract to the top (Pyramid Subtraction Puzzle): Given base numbers 29, 12, 6, 5. Fill the pyramid to the top.
Answer:
Base level: 29, 12, 6, 5
Level 2: \(29 - 12 = 17\), \(12 - 6 = 6\), \(6 - 5 = 1\)
Level 3: \(17 - 6 = 11\), \(6 - 1 = 5\)
Top level: \(11 - 5 = 6\)
In simple words: Subtract adjacent pairs of numbers in each row to get the number in the block above.

Exam Tip: Subtract the right number from the left number for each adjacent pair.

CROSSWORD PUZZLE - MULTIPLICATION

Question 10. Across 1. \(1 \times 11\)
Answer: 11
In simple words: Multiply 1 by 11 to get 11.

Exam Tip: Any number multiplied by 1 remains the same number.

Question 11. Across 3. \(7 \times 3\)
Answer: 21
In simple words: Multiply 7 by 3.

Question 12. Across 4. \(4 \times 5\)
Answer: 20
In simple words: 4 times 5 equals 20.

Exam Tip: Use skip counting by 5s four times.

Question 13. Across 5. \(7 \times 2\)
Answer: 14
In simple words: 7 multiplied by 2 is 14.

Exam Tip: Double the number 7.

Question 14. Across 7. \(8 \times 9\)
Answer: 72
In simple words: 8 times 9 gives 72.

Exam Tip: Memorize standard multiplication facts up to 10.

Question 15. Across 8. \(11 \times 5\)
Answer: 55
In simple words: 11 multiplied by 5 is 55.

Exam Tip: Multiply 11 by single digits by repeating the digit.

Question 16. Across 9. \(6 \times 10\)
Answer: 60
In simple words: Append a zero to 6 when multiplying by 10.

Exam Tip: Multiplying by 10 shifts digits one place to the left.

Question 17. Across 10. \(5 \times 6\)
Answer: 30
In simple words: 5 times 6 is 30.

Exam Tip: Count by 5s six times.

Question 18. Across 11. \(11 \times 3\)
Answer: 33
In simple words: 11 times 3 is 33.

Exam Tip: Use the property of repeating digits for 11.

Question 19. Across 12. \(7 \times 6\)
Answer: 42
In simple words: 7 times 6 equals 42.

Exam Tip: Recall table of 6 or 7.

Question 20. Across 13. \(9 \times 6\)
Answer: 54
In simple words: 9 multiplied by 6 is 54.

Exam Tip: Use finger tricks for multiplying by 9.

Question 21. Across 14. \(7 \times 12\)
Answer: 84
In simple words: 7 times 12 is 84.

Exam Tip: Compute as \(7 \times 10 + 7 \times 2 = 70 + 14 = 84\).

Question 22. Across 16. \(6 \times 11\)
Answer: 66
In simple words: 6 times 11 equals 66.

Exam Tip: Any single digit multiplied by 11 gives a two-digit number with both digits equal to that number.

Question 23. Across 17. \(11 \times 10\)
Answer: 110
In simple words: 11 multiplied by 10 is 110.

Question 24. Down 1. \(11 \times 11\)
Answer: 121
In simple words: 11 squared is 121.

Exam Tip: Memorize squares up to 15.

Question 25. Down 2. \(2 \times 5\)
Answer: 10
In simple words: 2 times 5 is 10.

Exam Tip: Basic multiplication fact.

Question 26. Down 3. \(2 \times 12\)
Answer: 24
In simple words: Double of 12 is 24.

Question 27. Down 5. \(2 \times 6\)
Answer: 12
In simple words: 2 times 6 equals 12.

Exam Tip: Half of 24 or double of 6.

Question 28. Down 6. \(3 \times 5\)
Answer: 15
In simple words: 3 times 5 is 15.

Exam Tip: Count by 5s three times.

Question 29. Down 7. \(10 \times 7\)
Answer: 70
In simple words: 10 times 7 is 70.

Exam Tip: Attach a zero to 7.

Question 30. Down 8. \(10 \times 5\)
Answer: 50
In simple words: 10 times 5 is 50.

Exam Tip: Basic multiplication by 10.

Question 31. Down 9. \(9 \times 7\)
Answer: 63
In simple words: 9 times 7 is 63.

Exam Tip: Use tables or the finger method for 9.

Question 32. Down 10. \(8 \times 4\)
Answer: 32
In simple words: 8 times 4 is 32.

Question 33. Down 11. \(7 \times 5\)
Answer: 35
In simple words: 7 times 5 is 35.

Exam Tip: Count by 5s seven times.

Question 34. Down 12. \(4 \times 11\)
Answer: 44
In simple words: 4 times 11 is 44.

Exam Tip: Repeat digit 4 twice.

Question 35. Down 13. \(8 \times 7\)
Answer: 56
In simple words: 8 times 7 is 56.

Exam Tip: Remember sequence \(56 = 7 \times 8\).

Question 36. Down 14. \(9 \times 9\)
Answer: 81
In simple words: 9 squared is 81.

Exam Tip: Basic square number.

Question 37. Down 15. \(5 \times 8\)
Answer: 40
In simple words: 5 times 8 is 40.

Exam Tip: Count by 5s eight times.

THE GOLDEN RULE CRYPTOQUIP

Decoding Key: 1=O, 2=H, 3=B, 4=L, 5=Q, 6=M, 7=F, 8=A, 9=V, 10=T, 11=J, 12=C, 13=S, 14=N, 15=E, 16=X, 17=G, 18=D, 19=P, 20=I, 21=Y, 22=K, 23=R, 24=W, 25=U, 26=Z

Decode the cipher text: 10 23 15 8 10 | 10 10 2 15 23 13 | 8 13 | 21 1 25 | 24 1 25 4 18 | 4 20 22 15 | 10 2 15 6 | 10 1 | 10 23 15 8 10 | 21 1 25

Answer: TREAT OTHERS AS YOU WOULD LIKE OTHERS TO TREAT YOU
In simple words: Substitute each number with its corresponding letter according to the cryptoquip key.

Exam Tip: Check each decoded letter carefully against the reference table provided.

Question 38. Complete the multiplication pattern:
\(5 \times 5 = 25\)
\(55 \times 5 = 275\)
\(555 \times 5 = 2775\)
\(5555 \times 5 = \text{\_\_\_\_\_\_\_\_\_\_\_\_\_}\)
(a) 2757575
(b) 27777
(c) 27775
(d) 277775
Answer: (d) 277775
Each step increases the number of 5s in the multiplier by one and inserts an extra '7' in the middle of the result: \(5555 \times 5 = 277775\).
In simple words: Notice the pattern of adding a 7 in the middle for each additional 5.

Exam Tip: Look at the number of digits and repeating patterns in the answers.

Question 39. Complete the pattern: 1, 3, 5, 7, 9, 11, 13, 15, \_\_\_\_\_, \_\_\_\__
(a) 17, 20
(b) 16, 17
(c) 17, 19
(d) None of the options
Answer: (c) 17, 19
The sequence consists of consecutive odd numbers increasing by 2 each time. After 15, the next numbers are \(15 + 2 = 17\) and \(17 + 2 = 19\).
In simple words: Add 2 to the previous number to get the next odd number.

Exam Tip: Identify whether the sequence uses arithmetic addition or multiplication.

PICTOGRAPH QUESTIONS

The pictograph shows how many cars were washed at the washing centre of a service station during four days of a week. (Note: One car icon represents 5 cars).

Question 40. On which day were the maximum numbers of cars washed?
Answer: Tuesday (having 8 car icons, which equals \(8 \times 5 = 40\) cars).
In simple words: Count which row has the most car pictures.

Exam Tip: Compare the length of the rows of icons directly without necessarily calculating the total every time.

Question 41. On which day were the minimum numbers of cars washed?
Answer: Wednesday (having 6 car icons, which equals \(6 \times 5 = 30\) cars).
In simple words: Find the row with the fewest car pictures.

Exam Tip: Scan for the shortest row of symbols in the table.

Question 42. How many total cars were washed on Monday and Thursday altogether?
Answer:
Monday icons = 4 (representing \(4 \times 5 = 20\) cars)
Thursday icons = 5 (representing \(5 \times 5 = 25\) cars)
Total cars = \(20 + 25 = 45\) cars.
In simple words: Add the number of cars washed on Monday and Thursday together.

Exam Tip: Multiply the total number of icons by the key value (5) at the end to save calculation steps.

MAGIC SQUARES

Vertical rows, horizontal rows and diagonals all add up to the same amount in a magic square. This total is known as the magic number or constant. Write the magic number in the bubble shown below.

Question 43. Find the magic number for the example magic square:
Row 1: 3, 8, 1
Answer:
Sum = \(3 + 8 + 1 = 12\)
In simple words: Add any complete row, column, or diagonal to find the magic constant.

Exam Tip: Always pick the row or column with no missing numbers to calculate the magic sum.

Question 44. Find the magic number for the first incomplete magic square on page 16 (containing 9, 10, 12, 11).
Answer:
Using standard 3x3 magic square properties or completing the rows where numbers are given: Magic number = 30.
In simple words: Complete the grid such that all rows, columns, and diagonals sum up to 30.

Exam Tip: Use known formulas or systematic trial for magic squares.

Question 45. Find the magic number for the second magic square on page 16 (containing 9, 13, 10, 17).
Answer:
Magic number = 36.
In simple words: The sum of each line in this magic square is 36.

Exam Tip: Verify across multiple directions to ensure the sum is constant.