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Grade 8: 猜测数字

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数学

北美数学的学习在思维和逻辑方式上有许多不同,同时,刚来的留学的同学可能也对很多数学的专有名词感到困惑。

 

今天,我们就来讲解几道Grade 8 数学的经典例题。

 

Problem 

Guess the Number

 

Below is a sample question for a Grade 8 student. The question is for a student of typical ability for this grade.

 

How many numbers between 77 and 177 are evenly divisible by 8?

 

This question requires the student to think logically.

 

The student’s first instinct should be to consider the number of numbers between 77 and 177. This can be obtained by:

 

177 - 77 = 100

 

Thus there are 100 numbers between 77 and 177.

 

In this group of 100 numbers, there are a certain amount that are evenly divisible by 8. To determine the amount, they can divide by 100 by 8.

 

100 / 8 = 12.5

 

Since there can’t be 12 and a half amount of numbers, 12.5 should round up to 13.

 

13 is the answer.

 

This logical reasoning is the basis behind all mathematics and here at Forbest Academy we encourage and nurture students’ logical thinking skills.

 

 

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