Factors and Factor Pairs for 4th Grade
A factor pair is two numbers that multiply to give a product, so finding all factor pairs of a number means testing each candidate up to its square root. The examples below show that systematic search, with practice problems and a full answer key.
DETAILED EXPLANATION
A factor of a number divides it evenly. Factor pairs are two numbers that multiply to give the number (e.g., 12: 1×12, 2×6, 3×4).
WORKED EXAMPLES WITH STEP BY STEP SOLUTIONS
Example 1
List all factor pairs of 18.
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Solutions:
Step 1: Apply the concept from the lesson above.
Step 2: Carry out the operation or reasoning.
Answer: 1×18, 2×9, 3×6. Pairs: (1,18), (2,9), (3,6).
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