Multiplying 3-Digit by 1-Digit Numbers for 4th Grade
To multiply a three-digit number by a one-digit number, multiply each place value in turn and add the partial products, carrying where a product exceeds nine. The examples below show the expanded method beside the standard algorithm, with practice problems and answers.
DETAILED EXPLANATION
Multiply a 3-digit number by a 1-digit number the same way: ones first, then tens, then hundreds, regrouping when needed.
WORKED EXAMPLES WITH STEP BY STEP SOLUTIONS
Example 1
Multiply 356 × 4.
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Solutions:
Step 1: Apply the concept from the lesson above.
Step 2: Carry out the operation or reasoning.
Answer: 356 × 4 = 1,424
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