Section A Section A Checkpoint

Problem 1

Use the standard algorithm to find the value of each product. Explain or show your reasoning.

  1. 628×25628 \times 25
  2. 359×63359 \times 63

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Solution
  1. 15,700. Sample response:

    multiplication algorithm

  2. 22,617. Sample response:

    multiplication algorithm

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Sample Response
  1. 15,700. Sample response:

    multiplication algorithm

  2. 22,617. Sample response:

    multiplication algorithm

Problem 2

  1. Lin says the value of 257×63257 \times 63 is about 1,500. Do you agree with Lin? Explain or show your reasoning.
  2. Use the standard algorithm to find the value of the product.
multiply. two hundred fifty seven times sixty 3. 2 rows. First row: two hundred fifty seven. Second row: multiplication symbol, sixty 3. Horizontal line.

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Solution
  1. No. Sample response:  200×10=2,000200 \times 10 = 2,000 and this product has a much greater value than 200×10200 \times 10.
  2. 16,191. Sample response:

    multiplication algorithm

Show Sample Response
Sample Response
  1. No. Sample response:  200×10=2,000200 \times 10 = 2,000 and this product has a much greater value than 200×10200 \times 10.
  2. 16,191. Sample response:

    multiplication algorithm