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Math reasoning-Puzzle 324

By Panos kalliantasis

Test your reasoning skills
Can you find the logical relation of the equations and then find the missing number?

 

 

If

4*5=21

5*6=34

6*7=51

Then

7*8=??

Try to solve it yourself and discover the rule that the equations follow.

 

See the answer and detailed explanation  

 The pattern is
A*B A*B+square 1,2,3,4,...
4*5 4*5 +1^2=20+1=21
5*6 5*6+2^2=30+4=34
6*7 6*7+3*2=42+9=51
7*8 7*8+4^2=56+16=72
Correct answer is 72

 

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70 Math reasoning eBook

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 70 selective math reasoning exercises to practice various arithmetic reasoning patterns
Try to solve them yourself and discover the rule that the equations follow.


In each exercise the answer and detailed reasoning are given to compare your answers and interactively develop your skills.


 

 

 

 

 






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