Number patterns · SET 13

What number should replace the question mark? Each group has two top numbers and two bottom numbers and a result: top 4, 12 and bottom 8, 4 gives 64; top 3, 9 and bottom 3, 12 gives 216; top 20, 9 and bottom 6, 2 gives ?. Answer with a natural number.

What number should replace the question mark? The pyramid rows from the top are: 9; ? 5; 2 2 5; 1 1 2 5. Answer with a natural number.

My watch was correct at midnight and then lost 14 minutes per hour until it stopped completely 7 hours ago. It now shows 3.50 am. How many hours after midnight is the correct time now? Answer with a natural number.

Each group has four numbers in a 2 x 2 block, and a total above or below: top 3, 5 / bottom 2, 6 gives 25; top 7, 9 / bottom 1, 4 gives 38; top 6, 3 / bottom 6, 2 gives ?. What number should replace the question mark? Answer with a natural number.

What number should replace the question mark? Each circle has four outer numbers (top left, top right, bottom left, bottom right) and a centre: 3, 9, 2, 8 with centre 6; 7, 4, 5, 3 with centre 1; 5, 6, 2, 3 with centre ?. Answer with a natural number.

What should be the missing number? 382: 115, 965: 1514, 283: ? Answer with a natural number.

Simplify 17/18 ÷ 34/108 = x. What is x? Answer with a natural number.

What number should replace the question mark? The circles contain: 71, 31, 61, 67, 19; 83, 61, 23, 53, 29; and 7, 61, 70, 37, ?. Answer with a natural number.

What number should replace the question mark? 16, 39, 85, 177, 361, ? Answer with a natural number.

Which of these calculations does not total 85? A: 18/9 divided by 8/330. B: 6^2 + 7^2. C: 1010101 (binary). D: LXXXV (Roman numerals). E: 2295/27.

Which of these calculations does not equal 512? A: 64 x 8. B: 2048 / 4. C: 23^2 - 17. D: 365 + 147. E: 494 + 18. F: 241 7/8 + 271 1/8.

What number should replace the question mark? 56, 67, 80, 88, 104, ? Answer with a natural number.

Start at a corner and spiral in to the centre to find the number to replace the question mark. Rows: 40 45 35 40 30; 50 75 80 70 75; 45 85 90 95 65; 55 80 90 ? 70; 50 60 55 65 60. Answer with a natural number.

What number should replace the question mark? Four circles are each split in three: top 7, left 5, right 4; top 9, left 6, right 5; top 12, left 15, right 9; top 6, left ?, right 3. Answer with a natural number.

What number should replace the question mark? Answer with a natural number.

Which number is missing from the puzzle? Answer with a natural number.

Which number do you need to add to complete the puzzle? Answer with a natural number.

Which number will complete the grid? Answer with a natural number.

63 (97) 49; 56 (73) 24; ? (36) 54. What number should replace the question mark? Answer with a natural number.

Each set of nine numbers relates to the other in a certain way. Work out the logic of the left-hand box to find the missing number in the right-hand box. Answer with a natural number.