Number Series Flashcards

What number comes next in the series: 3, 7, 11, 15, 19, ?

Answer: 23

This is a simple arithmetic progression. The pattern is to add 4 to the previous number to get the next number in the series (3 + 4 = 7, 7 + 4 = 11, and so on). Therefore, the next number is 19 + 4 = 23.

What number comes next in the series: 2, 5, 4, 7, 6, ?

Answer: 9

This series follows an alternating pattern of two operations: add 3, then subtract 1. The pattern is: 2 + 3 = 5; 5 - 1 = 4; 4 + 3 = 7; 7 - 1 = 6. The next step is to add 3, so 6 + 3 = 9.

What number comes next in the series: 1, 2, 4, 7, 11, ?

Answer: 16

The pattern involves adding a progressively increasing number to each term. First, 1 is added (1+1=2), then 2 is added (2+2=4), then 3 (4+3=7), then 4 (7+4=11). The next step is to add 5, so 11 + 5 = 16.

What number comes next in the series: 81, 27, 9, 3, ?

Answer: 1

This is a geometric progression where each number is divided by 3 to get the next number. 81 / 3 = 27; 27 / 3 = 9; 9 / 3 = 3. The final step is 3 / 3 = 1.

What number comes next in the series: 5, 10, 8, 16, 14, ?

Answer: 28

This series uses an alternating pattern of multiplying by 2, then subtracting 2. The pattern is: 5 * 2 = 10; 10 - 2 = 8; 8 * 2 = 16; 16 - 2 = 14. The next operation is to multiply by 2, so 14 * 2 = 28.

What number comes next in the series: 1, 4, 9, 16, 25, ?

Answer: 36

This series consists of perfect squares. Each number is the square of consecutive integers: 1^2 = 1, 2^2 = 4, 3^2 = 9, 4^2 = 16, 5^2 = 25. The next number in the sequence is 6^2, which is 36.

What number comes next in the series: 4, 5, 7, 10, 14, ?

Answer: 19

The pattern is to add a consecutively increasing number to the previous term. The sequence of additions is +1, +2, +3, +4, and so on. 4 + 1 = 5; 5 + 2 = 7; 7 + 3 = 10; 10 + 4 = 14. The next step is to add 5, so 14 + 5 = 19.