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## Help Our American Kids with Their Math

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## Maths – Puzzle 2

Weighty Problem If a baseball weighs 12 ounces plus half its own weight, how much does it weigh? Entertainment Mathematical Puzzles by Martin Gardner

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## Maths – Distributive Property

Notes: Distributive property is one of key links in elementary school maths. Indeed, in my opinion, if you really understand three concepts: fractions, negative numbers and the distributive property before you graduate from elementary school, you are good to go to middle school maths. How to group things in different ways, array or matrix. Or […]

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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 – Counting numbers

What is wrong with the following calculations? ;

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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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