Multiplying 2-Digit by 1-Digit Numbers for 4th Grade
To multiply a two-digit number by a one-digit number, multiply the ones, multiply the tens, and add the partial products, carrying where needed. The examples below show the area model first and then the standard algorithm, so the carrying makes sense.
DETAILED EXPLANATION
Multiply a 2-digit number by a 1-digit number by multiplying the ones first, then the tens, and regrouping if the product in ones is 10 or more.
WORKED EXAMPLES WITH STEP BY STEP SOLUTIONS
Example 1
Multiply 47 × 6.
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Solutions:
Step 1: Apply the concept from the lesson above.
Step 2: Carry out the operation or reasoning.
Answer: 47 × 6: 7×6=42 (write 2, carry 4); 4×6=24, 24+4=28. Answer: 282.
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