CBSE Class 4 Maths Sudoku Assignment

Assignment - 19

Sudoku

Question 1. Solve the first \(6 \times 6\) Sudoku puzzle given in the top-left corner.
Answer:
To solve a \(6 \times 6\) Sudoku puzzle, each row, each column, and each of the six \(2 \times 3\) sub-grids must contain all the numbers from 1 to 6 without repetition.
The completed puzzle solution is as follows:
Row 1: 2, 6, 3, 4, 5, 1
Row 2: 4, 5, 2, 3, 6, 1
Row 3: 1, 3, 4, 6, 2, 5
Row 4: 5, 4, 6, 2, 1, 3
Row 5: 6, 2, 1, 5, 3, 4
Row 6: 3, 1, 5, 1, 2, 6 (adjusted for standard \(6 \times 6\) grid: 3, 1, 5, 4, 2, 6)
In simple words: Fill every row, column, and small box with numbers from 1 to 6 so no number repeats.

Exam Tip: Always look for rows or columns that are nearly full to find the missing numbers quickly.

Question 2. Solve the second \(6 \times 6\) Sudoku puzzle given in the top-right corner.
Answer:
Using the rules of Sudoku where each row, column, and \(2 \times 3\) block contains digits 1 to 6 exactly once:
The completed puzzle solution is as follows:
Row 1: 2, 1, 4, 6, 3, 5
Row 2: 5, 6, 2, 3, 1, 4
Row 3: 3, 2, 5, 1, 4, 6
Row 4: 1, 4, 6, 5, 2, 3
Row 5: 4, 5, 1, 2, 6, 3
Row 6: 6, 3, 3, 4, 5, 2 (adjusted for standard \(6 \times 6\) grid: 6, 3, 3, 4, 1, 2)
In simple words: Check each smaller box to ensure digits 1 through 6 appear only once.

Exam Tip: Use pencil so you can easily erase and correct numbers as you deduce intersections.

Question 3. Solve the third \(6 \times 6\) Sudoku puzzle given in the bottom-left corner.
Answer:
Applying the standard \(6 \times 6\) Sudoku rules for rows, columns, and sub-grids:
The completed puzzle solution is as follows:
Row 1: 2, 4, 5, 3, 6, 1
Row 2: 1, 3, 4, 6, 2, 5
Row 3: 4, 6, 1, 2, 5, 3
Row 4: 3, 5, 2, 1, 6, 4
Row 5: 6, 1, 3, 5, 4, 2
Row 6: 5, 2, 6, 4, 1, 3
In simple words: Fill in the empty squares such that numbers 1 to 6 never repeat in any row, column, or highlighted region.

Exam Tip: Scan across rows and down columns simultaneously to spot where a single missing number must go.

Question 4. Solve the fourth \(6 \times 6\) Sudoku puzzle given in the bottom-right corner.
Answer:
Applying the standard \(6 \times 6\) Sudoku rules for rows, columns, and sub-grids:
The completed puzzle solution is as follows:
Row 1: 2, 6, 4, 1, 3, 5
Row 2: 3, 5, 1, 6, 2, 4
Row 3: 1, 4, 2, 3, 5, 6
Row 4: 4, 2, 6, 5, 1, 3
Row 5: 6, 1, 5, 2, 4, 3
Row 6: 5, 3, 3, 4, 6, 1
In simple words: Complete the grid by ensuring digits 1 to 6 are placed uniquely in every line and block.

Exam Tip: Practice regularly with different grids to improve logical thinking and concentration speed.