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Matrix Coding - Intermediate Level: grid coding INTERMEDIATE

Quick mental agility ★ session: 20 intermediate-level matrix coding questions. Worksheet 17 of 30 - Focus: grid coding. Practice row-column decoding, position coding, matrix manipulation with instant feedback. Great for mid-level students needing moderate complexity with mixed patterns practice.

📝 Worksheet 17 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Intermediate level

What you'll learn in this worksheet:
Your progress through Matrix Coding
Worksheet 17 of 30 (56% complete)

Question 1

Find the missing element (?) in this matrix pattern: 2 4 6 4 8 12 6 12 ? What should replace the '?'?
Pattern: multiplication table pattern

Step 1: First row: multiples of 2 (2×1, 2×2, 2×3)
Step 2: Second row: multiples of 4 (4×1, 4×2, 4×3)
Step 3: Third row: multiples of 6 (6×1, 6×2, 6×3)
Step 4: Missing cell is 6×3 = 18
Pattern: Matrix[i][j] = (row_value) × (j+1)

Answer: 18
pattern, completion, reasoning

Question 2

Using this 5×5 cipher matrix: ★ ♠ ♣ ♥ ♦ ♣ ♥ ♦ ★ ♠ ♦ ★ ♠ ♣ ♥ ♠ ♣ ♥ ♦ ★ ♥ ♦ ★ ♠ ♣ Letters A-T map to cells in row-major order (A→★, B→♠, C→♣, D→♥, E→♦, etc.) What is the encoded form of 'CODE'?
Encoding 'CODE': C→♣ O→♥ D→♥ E→♦ = ♣♥♥♦
decoding, cipher, puzzle

Question 3

Original matrix: 2 4 6 8 10 12 14 16 18 After column-reversed transformation, the matrix becomes:
Applying column-reversed transformation yields:
14 16 18
8 10 12
2 4 6
transformation, geometry, rotation

Question 4

If letters are at coordinates A(1,1), B(1,2), C(1,3), D(1,4), E(2,1), F(2,2), G(2,3), H(2,4), I(3,1), J(3,2), K(3,3), L(3,4), M(4,1), N(4,2), O(4,3), P(4,4), then 'MATH' coordinates are?
Coordinate mapping: M(4, 1) A(1, 1) H(2, 4)
coordinates, position, mapping

Question 5

In matrix: 2 9 4 7 5 3 6 1 8 Which column has the minimum sum?
Column sums: Col1=15, Col2=15, Col3=15. Minimum is Column 1 with sum 15
operations, analysis, comparison

Question 6

In matrix: 2 9 4 7 5 3 6 1 8 Which row has the maximum sum?
Row sums: Row1=15, Row2=15, Row3=15. Maximum is Row 1 with sum 15
operations, analysis, comparison

Question 7

Using this 5×5 cipher matrix: ★ ♠ ♣ ♥ ♦ ♣ ♥ ♦ ★ ♠ ♦ ★ ♠ ♣ ♥ ♠ ♣ ♥ ♦ ★ ♥ ♦ ★ ♠ ♣ Letters A-T map to cells in row-major order (A→★, B→♠, C→♣, D→♥, E→♦, etc.) What is the encoded form of 'MATRIX'?
Encoding 'MATRIX': M→♠ A→★ T→★ R→♥ I→★ = ♠★★♥★
decoding, cipher, puzzle

Question 8

In matrix: 1 4 7 2 5 8 3 6 9 Which row has the minimum sum?
Row sums: Row1=12, Row2=15, Row3=18. Minimum is Row 1 with sum 12
operations, analysis, comparison

Question 9

If letters are at coordinates A(1,1), B(1,2), C(1,3), D(1,4), E(2,1), F(2,2), G(2,3), H(2,4), I(3,1), J(3,2), K(3,3), L(3,4), M(4,1), N(4,2), O(4,3), P(4,4), then 'INFO' coordinates are?
Coordinate mapping: I(3, 1) N(4, 2) F(2, 2) O(4, 3)
coordinates, position, mapping

Question 10

If letters are at coordinates A(1,1), B(1,2), C(1,3), D(1,4), E(2,1), F(2,2), G(2,3), H(2,4), I(3,1), J(3,2), K(3,3), L(3,4), M(4,1), N(4,2), O(4,3), P(4,4), then 'TEXT' coordinates are?
Coordinate mapping: E(2, 1)
coordinates, position, mapping

Question 11

If A=0001, B=0010, C=0011, D=0100, E=0101, F=0110, G=0111, H=1000, I=1001, J=1010, K=1011, L=1100 (binary sequence 1-12), then 'HEAD' in binary?
Binary coding: H=1000 + E=0101 + A=0001 + D=0100 = 1000010100010100
binary, advanced, encoding

Question 12

In a 6×6 matrix (row0-5, col0-5) containing letters A-Z and digits 0-9 in row-major order, encode 'ENCODE' by giving row and column numbers concatenated.
Position mapping: E→(0,4) N→(2,1) C→(0,2) O→(2,2) D→(0,3) E→(0,4) → 042102220304
cipher, position, encoding

Question 13

If A=0001, B=0010, C=0011, D=0100, E=0101, F=0110, G=0111, H=1000, I=1001, J=1010, K=1011, L=1100 (binary sequence 1-12), then 'HEAD' in binary?
Binary coding: H=1000 + E=0101 + A=0001 + D=0100 = 1000010100010100
binary, advanced, encoding

Question 14

In matrix: 3 8 1 5 2 7 9 4 6 Which row has the minimum sum?
Row sums: Row1=12, Row2=14, Row3=19. Minimum is Row 1 with sum 12
operations, analysis, comparison

Question 15

Matrix A: 6 6 8 3 3 6 3 8 2 Matrix B: 1 9 6 8 4 1 3 7 8 What is the result of matrix addition (element-wise)?
Performing element-wise addition:
Row1: 6+1=7 + 6+9=15 + 8+6=14
Row2: 3+8=11 + 3+4=7 + 6+1=7
Row3: 3+3=6 + 8+7=15 + 2+8=10
arithmetic, operations, calculation

Question 16

If letters are at coordinates A(1,1), B(1,2), C(1,3), D(1,4), E(2,1), F(2,2), G(2,3), H(2,4), I(3,1), J(3,2), K(3,3), L(3,4), M(4,1), N(4,2), O(4,3), P(4,4), then 'INFO' coordinates are?
Coordinate mapping: I(3, 1) N(4, 2) F(2, 2) O(4, 3)
coordinates, position, mapping

Question 17

If A=0001, B=0010, C=0011, D=0100, E=0101, F=0110, G=0111, H=1000, I=1001, J=1010, K=1011, L=1100 (binary sequence 1-12), then 'LEAD' in binary?
Binary coding: L=1100 + E=0101 + A=0001 + D=0100 = 1100010100010100
binary, advanced, encoding

Question 18

In pattern matrix: * @ # $ @ # $ * # $ * @ $ * @ # Code 'ABCD' using A=col1, B=col2, C=col3, D=col4, row advances sequentially (row0, row1, row2, row3, then repeats)?
Coding process: A→* B→# C→* D→# = *#*#
pattern, symbols, coding

Question 19

In the 4×4 matrix: A B C D E F G H I J K L M N O P If we follow the main diagonal path (Start at (1,1) and move diagonally down-right), what word do we get?
Following the main diagonal path: (1,1)=A (2,2)=F (3,3)=K (4,4)=P → AFKP
path, navigation, reading

Question 20

Matrix A: 2 9 6 4 5 1 2 4 3 Matrix B: 2 4 5 2 9 2 7 2 4 What is the result of matrix addition (element-wise)?
Performing element-wise addition:
Row1: 2+2=4 + 9+4=13 + 6+5=11
Row2: 4+2=6 + 5+9=14 + 1+2=3
Row3: 2+7=9 + 4+2=6 + 3+4=7
arithmetic, operations, calculation
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