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Digits may follow distinct patterns in the terms of a number sequence. Examples include increasing or decreasing, or adding up to a certain number.

Example 2

{19, 28, 37, 46, 55, 64, 73, 82, ?}

Answer:91

Explanation: The first digit increases by one, and the second digit decreases by one.

Example 2

{102, 204, 306, 408, 500, 602, 704, 806, 908, ?}

Answer: 1000

Explanation: The first two digits are multiples of ten, and the third digit is a progression of even numbers 2,4,6,8,0.

1. {446, 547, 648, 749, 846, 947, 448, 549, 646, ?, 848, 949, ?}

Answer: 747, 446

Explanation: the first digit's cycle is from 4-5-6-7-8-9, the second digit stays the same, and the last digit's cycle is 6-7-8-9

2. {43201, 43202, 43212, 43312, 44312, 54312, 54313, 54323, 54423, ?}

Answer: 55423

Explanation: Each digit increases by one each time, starting with the rightmost digit and going left.

43201 becomes 43202. The next digit to increase by one is 0, and therefore the next term is 43212

3. {278, 269, 197, 188, 179, 98, ?}

Answer:89

Explanation: All the digits add up to seventeen, in decreasing order.

4. {10, 11, 20, 12, 21, 30, 13, 22, 31, ?}

Answer: 40

Explanation: Two digit numbers in order, where the digits add up to one, two, three and lastly four.

5. {1137, 1119, 93, 75, 57, ?}

Answer: 39

Explanation: In decreasing order, odd numbers that add up to twelve.