<H2>Competitive reasoning-find-missing number-page3</h2>

 21. Find the missing number

Answer  The pattern is:The number in the center of the square is the average of the numbers at the vertices of the square. 4+6+6+8/4=24/4=6 5+7+3+9/4=24/4=6 8+12+12+16/4=Χ Χ=12 

 

22. Find the missing number

 

  Answer  The pattern is:We multiply by the terms of the sequence 1, 3,5,7,9,.... 3Χ1=3 3Χ3=9 9Χ5=45 45Χ7=315 315Χ9=2835

 

23.  Find the missing number

 

  Answer  The pattern is:If a, b, c are the numbers of a row, then ( a+c)/9=b 28+17/9=5 29+16/9=5 32+X/9=6 So X=22

 

24. Find the missing number.

 

 

 

  Answer  The pattern is:If a, b, c,d are the numbers of a row a+b=c a-b=d 10+5=15 10-5=5 20+5=25 20-5=15 30+10=40 30-10=20 40+20=60 40-20=20

25. Find the missing number.

 

 

  Answer  The pattern is:If a, b, c If a,b,c are the numbers of the vertices of the triangle aX(b+2)=c 3X(5+2)=21 4X(6+2=32 7X(3+2)=35

 

26. Find the missing number

 

 

  Answer  The pattern is:If a, b, c are the numbers of the vertices of the triangle aXb+(a+b)=c 1X4+(1+4)=9 2X5+(2+5)=17 3X6+(3+6)=27

 

27. Find the missing number

 

 

  Answer  The pattern is:If a, b, c are the numbers of a column then a+2b=c 12+2*8=28 36+2*24=84 X+2*36=86 X=14

 

28. Find the missing number

 

  Answer  The pattern is:24+60+48+40=172 27+36+56+X=200 X=81

 

29. Find the missing number

 

  Answer  The pattern is: Column (15+16+24+41)/4=24 (16+12+18+74)/4=30 (12+17+27+68)/4=31>

 

 

 

 30. Find the missing number

 

  

  Answer  The pattern is:If a, b, c are the numbers of a shape (a+b)^2=c (2+3)2=25 (4+3)^2=49 (5+2)^2=X=49

 

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