Find the missing number: 1, 4, □, 10, 13

Step by step

The question

Question: what is the missing number?

1, 4, □, 10, 13.

1 Find the jumps

2 Find the rule

Every jump is the same: +3.

The rule is: add 3 each time.

3 Use the rule

The number before the box is 4.

4 + 3 = 7.

So the missing number is 7.

4 Check

One more jump from 7 must give 10.

7 + 3 is 10.

Yes!

It works.

Let's look back.

First: find the jumps.

Then: find the rule.

Then: use the rule.

Last: check.