Study participants included 587 first-grade students and their parents. Families were given an iPad installed with a version of the Bedtime Math app, with which parents and their children read stories and answer questions involving math, including topics like counting, shapes and problem-solving. A control group received a reading app that had similar stories without the math content and questions related to reading comprehension instead. Children’s math achievement was assessed at the beginning and end of the school year. Parents completed a questionnaire about their nervousness with math. 

　　  The more times parents and children in the math group used the app, the higher children’s achievement on a math assessment at the end of the school year. Indeed, children who frequently used the math app with their parents outperformed similar students in the reading group by almost three months in math achievement at year’s end.

　　32. Bedtime Math is an iPad app that _____.

　　A. requires parents and children to answer reading comprehension questions

　　B. assesses children’s math achievement and parents’ nervousness with math

　　C. teaches children how to count, recognize shapes and solve practical problems

　　D. encourages children together with their parents to solve math story problems

　　33. The previous study found that _____.

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