Step by step
The question
Question: what comes next?
10, 20, 30, 40, □.
10, 20, 30, 40, □
1 Find the jumps
2 Find the rule
Every jump is the same: +10.
The rule is: add 10 each time.
= Rule: add 10 each time
3 Use the rule
The number before the box is 40.
40 + 10 = 50.
40 + 10 = 50
So the next number is 50.
= 10, 20, 30, 40, 50
4 Check
We go one jump back.
50 − 10 is 40.
Yes!
It works.
50 − 10 = 40
Let's look back.
First: find the jumps.
Then: find the rule.
Then: use the rule.
Last: check.
Answer
= 10, 20, 30, 40, 50