Continuing number sequences
You learn to find the rule in a number sequence and continue it.
How to work it out
- Look at what happens between two numbers next to each other.
- The same amount may be added each time, the difference may grow, or it may double.
- Do the same to the last number.
3 · 7 · 11 · 15 · …
- Look at what happens between two numbers next to each other: from 3 to 7 is +4, and from 7 to 11 too.
- The rule is: add 4 each time.
- So after 15 comes 19.
More examples
2 · 4 · 8 · 16 · …
Double each time: 32.
1 · 4 · 9 · 16 · …
- Square numbers: 1 × 1, 2 × 2, 3 × 3, 4 × 4.
- Then 5 × 5 = 25.