Number puzzles - Section 1
Practice and master this topic with our carefully crafted questions.
Multiply the 2 numbers in the outer segments together and add 1 to give the value in the inner segment opposite.
Working in columns, start with the top number, and subtract the number in the centre, to give the result in the bottom row.
In each star, the central value equals the sum of the top and lower two numbers, minus the left and right hand numbers.
Starting with the left hand circle, add 4 to each number and rotate their positions 1 place clockwise to give the values in the upper right hand circle, then add 5 to each of these values and rotate their positions 1 place clockwise.
As you move across, numbers follow the sequence of Square Numbers, from 36 to 121, subtracting 10 for the second number, 20 for the next, then 30 etc.
Each row and column of the diagram adds up to 15.
Working in rows, starting with the central row, add the left and right hand digits together and put the result in the central space. Repeat for the upper and lower rows, but put the result in the opposite central space.
Starting on the left, halve the first number and add it to the second number to give the next one along. Repeat this sequence all the way to the right.
Starting with the top 3 digit number, the first digit increases by 2 as you descend, from 1 to 11. The middle digit decreases by 1 each time, and the right hand digit alternates between 5 and 3.
The numbers in each row of the diagram add up to 18.