Skip to main content
### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# I Like ...

Alex from Elm Park Primary School in New Zealand sent in the following:

The rule is the number must be divisible by 5.

Because 5 and 15 are both divisible by 5 and 18 and 22 are not.

Haima from Tempo School in Canada sent in this work:

Gwenny who is home-schooled in the United Kingdom wrote:

I think the rules could be:

1) He only likes numbers with 5 in them

2) He only likes odd numbers

3) He only likes numbers in the 5 times table

4) He only likes numbers that have a 5 in the units

To test the rule, I would ask him if he likes the number 53. If he put it in the "don't like" column, we would know it wasn't rule 1 or 2. If he put it in the "like" box, we would know it wasn't rule 3 or 4. My next number to ask would be 50. This way, I would find out if it was odd numbers or numbers with 5 in that he liked.

Elie from The International School of Brussels sent this in:

click to see full size

and from Lumina:

click to see full size

Thank you for these observations and thoughts.

## You may also like

### Let's Investigate Triangles

Or search by topic

Age 5 to 7

Challenge Level

- Problem
- Getting Started
- Student Solutions
- Teachers' Resources

Alex from Elm Park Primary School in New Zealand sent in the following:

The rule is the number must be divisible by 5.

Because 5 and 15 are both divisible by 5 and 18 and 22 are not.

Haima from Tempo School in Canada sent in this work:

Gwenny who is home-schooled in the United Kingdom wrote:

I think the rules could be:

1) He only likes numbers with 5 in them

2) He only likes odd numbers

3) He only likes numbers in the 5 times table

4) He only likes numbers that have a 5 in the units

To test the rule, I would ask him if he likes the number 53. If he put it in the "don't like" column, we would know it wasn't rule 1 or 2. If he put it in the "like" box, we would know it wasn't rule 3 or 4. My next number to ask would be 50. This way, I would find out if it was odd numbers or numbers with 5 in that he liked.

Elie from The International School of Brussels sent this in:

click to see full size

and from Lumina:

click to see full size

Thank you for these observations and thoughts.

Vincent and Tara are making triangles with the class construction set. They have a pile of strips of different lengths. How many different triangles can they make?