IXL | Identify mistakes in number patterns

Tori tried to find the rule for this pattern.

13, 19, 25, ...

Tori says that the rule is add 7 because 13 plus 7 is 19. Is Tori's rule correct?

No, Tori's rule doesn't work for every number in the pattern. The rule should be add

No, Tori should have added more carefully. 13 plus 7 is not 19. The rule should be add

Yes, Tori's rule is correct.

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Learn with an example

question

Ian tried to write a pattern that starts with the number 72 and has the rule divide by

Here is what Ian wrote:

72, 36, 16, ...

Is Ian's pattern correct?

No, the number after 36 should be 9 because 36 divided by 4 is 9.

No, the number after 36 should be 18 because 36 divided by 2 is 18.

Yes, Ian's pattern is correct.

solution

Ian tried to write a pattern that starts with the number 72 and has the rule divide by

The first number in the pattern is

72.

Use the rule to find the next number after 72. Divide 72 by 2.

The number after 72 is

36.

Use the rule again to find the next number after 36. Divide 36 by 2.

The number after 36 is

18.

Here is the correct pattern:

72, 36, 18, ...

Here is Ian's pattern:

72, 36,

16,

...

So, Ian's pattern is not correct. The number after 36 should be 18 because 36 divided by 2 is 18.

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Teacher tools

Work it out

Not feeling ready yet? These can help:

O.1Use a rule to complete a number pattern

O.2What is true about the given pattern?

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