Identify the missing number
3 17 6 14 10 5 5 25 ? 7
Answer: A
Explanation: The numbers in the top row add up to 50. Therefore the answer must be 13 to make the numbers in the bottom row add up to 50. Note that the presence of two adjacent 5’s in the bottom row beneath different numbers offers a strong hint that the relationship can not be between corresponding numbers in the top and bottom rows.
Identify the missing number.
41 48 33 40 62 55 ? 47
Answer: D
Explanation: Starting from the box on the top left, move clockwise adding 7 each time. The answer is 54 which is 47 +7.
3 6 2 6 1 8 1 ?
Explanation: The numbers in the top row are multiplied to give the numbers in the bottom row – one digit per box. 3 * 6 = 18 (written as 1 and 8). Therefore the answer is 2 since 12 (written 1 and 2) is the product of 2 times 6.
34 40 45 1 10 6 0 ?
Explanation: The numbers in the boxes on the left add up to 90. The answer must be 44 to make the numbers in the boxes on the right add up to 90.
3 9 4 8 81 3 ? 4
Answer: B
Explanation: The number in the bottom left is the product of the other three numbers.