Ray's New Practical Arithmetic · Art. 58 · Unit 6: United States Money

29. Multiplying money

Goal: Your child multiplies a sum of money and places the decimal point correctly in the product.

⏱ About 35 minutes · 6 steps

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You'll need

  • The book
  • A slate, small whiteboard or scrap paper
  • A notebook and pencil

What's in the book

The rule for multiplication of United States money and 23 problems with printed answers, many about prices of goods.

The lesson, step by step

  1. Warm-up

    Mental: 3 × $1.25? 4 × 75 cents? 10 × $2.50?

  2. The rule

    Read:

    Multiply as in Simple Numbers.

    Put the decimal point in the same place in the product as it is in the multiplicand.

  3. Work the book example

    Read:

    What will 13 cows cost, at 47 dollars 12 cents 5 mills each?

    Write $47.125 × 13. Multiply as whole numbers: 47125 × 13 = 612625. Three figures after the point: $612.625.

  4. Guided practice

    Do problem 2 together:

    Multiply $7.835 by 8.

    (Answer $62.68: 62.680 with the last 0 dropped.)

  5. Independent practice

    Your child does problems 3 to about 15; the rest another day.

  6. Check and wrap-up

    Answers are printed. Mental: 6 pencils at 5 cents? 12 eggs at 3 cents? 8 books at $1.50?

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