Whole Number Multiplication 7/9/25

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12 Terms

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What is repeated addition?

Adding the same number over and over

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Example of repeated addition

55 + 55 + 55… (13 times) = 715

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Why is repeated addition not ideal?

It takes a lot of time

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What is the faster way to multiply?

Standard algorithm (stacked multiplication)

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Example problem

55 × 13

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Step 1: Multiply by the ones digit

3 × 5 = 15 → write 5, carry 1

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Continue step 1

3 × 5 = 15 + 1 = 16 → full result = 165

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Step 2: Multiply by the tens digit (1)

Add a placeholder zero

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1 × 5 = 5 and 1 × 5 = 5

→ result = 550

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Step 3: Add the results

165 + 550 = 715

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Final answer of 55 × 13

715

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Different ways to write multiplication

6 × 5, 6 * 5, 6(5)