Evaluate: 12345679 × 72.

Given data

• Compute 12345679 × 72.

Concept / Approach

• Use the classic pattern: 12345679 × 9 = 111111111. Then scale appropriately.
• Since 72 = 8 × 9, we can compute sequentially.

Step-by-step calculation

12345679 × 9 = 111111111111111111 × 8 = 888888888

Verification

Direct multiplication (calculator or long multiplication) matches the patterned result.

Common pitfalls

• Multiplying by 72 directly and making arithmetic errors; using the 9-multiple pattern simplifies.

Final Answer

888888888