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Martin correctly answered 90% of the questions on a math test that has 40 items or questions. So you should find the product of the items and the percent of correct answers.
Then subtract the product to the number of items.
            40 * .90 = 36
So: 40-36=4
So the number of his incorrect answers is 4.

Reply me if correct. :) :) :)
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4 questions are answered incorrectly by martin.
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