
Concept explainers
a. Select a variety of one- and two-digit numbers between 1 and 99 and multiply each by 9.
Record your results.
b. Find the sum of the digits in each of your products in part (a). If the sum is not a one-digit number.
find the sum of the digits of the resulting sum again until you obtain a one-digit number.
c. Make a conjecture about the sum of the digits when a one- or two-digit number is multiplied by 9

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