By L. Clark Lay

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**Extra info for Arithmetic - An Introduction to Mathematics**

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7 • 8) • 125 • (5 (5 14) • 12. 2 13) • • (5 • 21) Distributive Principle The number (5) (3) + (4) (7) is illustrated below, each product being repre- sented by a rectangular pattern. $$:£ To determine the total * * * * * * number ): $ $ ^ * * -i :£ * * * * -Jf: * of objects one could do two multiplications separately and then add, since (5) (3) + (4) (7) is a sum of two products. Now change the problem so that one factor in the first product is used again in the second. One such expression * * * * * * * * * is (5) (3) * * The work might be done * * :i< :':• + ^ (5) (7).

7 + ' 2-3 -2-3 10 2° 5 « 2i. D* [Ch. 3 u • 24. 9-4-2 + 4-2 Verbal Problems 3-9. Problems (32) The mathematical models for these problems are to be conditional equations The com- constructed on addition, subtraction, multiplication, and division. mutative, associative, and distributive principles often ways 1. A A Three girls girl's Mr. Grant bought If a it bus fare A 15 cents, is good is ticket sale 8. from the lot? tickets How many What was steps will he take in ? He spent $2,300 for repairs and What was his profit?

2 13) • • (5 • 21) Distributive Principle The number (5) (3) + (4) (7) is illustrated below, each product being repre- sented by a rectangular pattern. $$:£ To determine the total * * * * * * number ): $ $ ^ * * -i :£ * * * * -Jf: * of objects one could do two multiplications separately and then add, since (5) (3) + (4) (7) is a sum of two products. Now change the problem so that one factor in the first product is used again in the second. One such expression * * * * * * * * * is (5) (3) * * The work might be done * * :i< :':• + ^ (5) (7).

### Arithmetic - An Introduction to Mathematics by L. Clark Lay

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