Question

24. The stock market has been taking a beating lately. For the last four days the Dow Jones has dropped by 300 points a day. (a) Write a repeated addition sentence using negative numbers models how the Dow Jones has been changing. (b) Write an equivalent multiplication sentence to what you wrote in part (a) Evaluate this product.

Answer 1

Part (a)

Answer: -300 + (-300) + (-300) + (-300)

We have four copies of -300 added together. Use parenthesis to help separate the pluses and minuses.

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Part (b)

Answer: 4*(-300) or -300*4. It multiplies to -1200

Since we add four copies of -300, we can use the shortcut to multiply 4 by -300. Another example of this would be 3+3 = 2*3

The result of 4*(-300) is -1200. Therefore, the Dow Jones has dropped a total of 1200 points.