Step by step
The question
Question: what comes next?
3, 6, 9, 12, □.
3, 6, 9, 12, □
1 Find the jumps
2 Find the rule
Every jump is the same: +3.
The rule is: add 3 each time.
= Rule: add 3 each time
3 Use the rule
The number before the box is 12.
12 + 3 = 15.
12 + 3 = 15
So the next number is 15.
= 3, 6, 9, 12, 15
4 Check
We go one jump back.
15 − 3 is 12.
Yes!
It works.
15 − 3 = 12
Let's look back.
First: find the jumps.
Then: find the rule.
Then: use the rule.
Last: check.
Answer
= 3, 6, 9, 12, 15