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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What is wrong with the following calculations? ;

Read More "Maths – Counting numbers"## 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 […]

Read More "Maths – Negative Numbers"## 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 […]

Read More "Maths – operation orders"## 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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