Multiplying 2-Digit by 2-Digit Numbers for 4th Grade
To multiply two two-digit numbers, find four partial products and add them, which is what the standard algorithm compresses into two rows. The examples below show the area model beside the algorithm, so you can see where each row comes from, with practice problems.
DETAILED EXPLANATION
To multiply two 2-digit numbers, use the standard algorithm: multiply by the ones digit of the second number, then by the tens digit (writing with a zero in the ones place), then add the two partial products.
WORKED EXAMPLES WITH STEP BY STEP SOLUTIONS
Example 1
Multiply 24 × 13.
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Solutions:
Step 1: Apply the concept from the lesson above.
Step 2: Carry out the operation or reasoning.
Answer: 24×3=72; 24×10=240; 72+240=312.
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