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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Similar puzzles Math reasoning
70 Math reasoning problems-eBook
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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