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## Maths – Percent

Translate words into maths expressions. In the above case, step 2: tell the relationship between 15, ?%, and 16. Then you surely can figure out ?%. Caution: ?% = ?/100 In the above case, step 2: tell the relationship between ?%, 83, and 36. Then you surely can figure out ?%. Question: A stadium can […]

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## Maths – Fraction Division and Multiplication

Fraction Division Five approaches to make sense of Invert and Multiply Other references:  Noted-Understanding Division of Fractions- An Alternative View Making Sense of Invert and Multiply Why do we Invert and Multiply  Fraction Multiplication Note: Imagine multiplying a fraction by a whole number as adding the fraction to itself that many times.  Alternatively, imagine multiplying […]

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## Maths – Puzzle

The Colored Socks Ten red socks and ten blue socks are all mixed up in a dresser drawer. The twenty socks are exactly alike except for their color. The room is in pitch darkness and you want two matching socks. What is the smallest number of socks you must take out of the drawer in […]

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## Maths – Negative Numbers

Simplify the expression. Is the following work correct? If not, please correct it. Can you imagine why a person made this mistake? 2 – 8m + 2m + 6 + 8m = 8 – 18m One possible reason for this mistake: The person does not know the sign in front of a term goes with […]

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## Maths – operation orders

Is the following calculation correct? If not, please correct it. Can you imagine why a person made this mistake? 7 – (5 – 2) = (5 -2) – 7 One possible reason for this mistake: The person remembers to do what is in parentheses first. So when being asked show your work, he put parentheses […]

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## Maths – Numbers and Subtractions

Is the following calculation correct? If not, please correct it. Can you imagine why a person made this mistake? Two possible reasons for this mistake: The person confused numbers 24, 18, as 2, 4, 1, 8. Thus, he does not understand a number is composed of digits (from 0 to 9) and each digit’s place […]

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## Cyberbully

7年级女儿的一个同学这学期选修了“新闻学”课。她选择了“网络欺凌－Cyberbully”这个题目，采访了我作为一个家长的看法。 下面是她的问题和我的回答。 Dear xxx,    I am happy and honored to have this chance to answer your questions. It gave me a chance to think about the cyberbullying as well. ​   Hope you are satisfied with my answers. If you want me to give more details for any question, please feel free to ask.  […]