## One Basket or Group Photo

nrich maths
Updated:
2016
1 Comment
Resource
• Math
• K-2, 3-5, MS, HS
Common Core
<p>Libby Jared helped to set up NRICH and this is one of her favourite problems. It’s a problem suitable for a wide age range and best tackled...

## A maze of directions

nrich maths
Updated:
2016
1 Comment
Resource
• Math
• K-2, 3-5
Use the blue spot to help you move the yellow spot from one star to the other. How are the trails of the blue and yellow spots related?

## Color building

nrich maths
Updated:
2016
1 Comment
Resource
Common Core
<p>Using only the red and white rods, how many different ways are there to make up the other colors of rod?</p> Aligned to Common Core...

## Triangle pin-down

nrich maths
Updated:
2016
1 Comment
Resource
• Math
• K-2, 3-5
Use the interactivity to investigate what kinds of triangles can be drawn on peg boards with different numbers of pegs.

## Triangles all around

nrich maths
Updated:
2016
1 Comment
Resource
• Math
• K-2, 3-5
Can you find all the different triangles on these peg boards, and find their angles?

## Board block challenge

nrich maths
Updated:
2016
1 Comment
Resource
• Math
• K-2, 3-5
Choose the size of your pegboard and the shapes you can make. Can you work out the strategies needed to block your opponent?

## Number differences

nrich maths
Updated:
2016
1 Comment
Resource
• Math
• K-2, 3-5
Place the numbers from 1 to 9 in the squares below so that the difference between joined squares is odd. How many different ways can you do this?

## Diagonal sums

nrich maths
Updated:
2016
1 Comment
Resource
• Math
• K-2, 3-5
In this 100 square, look at the green square which contains the numbers 2, 3, 12 and 13. What is the sum of the numbers that are diagonally opposite...

## 19 hexagons

nrich maths
Updated:
2016
1 Comment
Resource
• Math
• K-2, 3-5, MS, HS
Common Core
<p>In this maze of hexagons, you start in the center at 0. The next hexagon must be a multiple of 2 and the next a multiple of 5. What are the...

## Part the piles

nrich maths
Updated:
2016
1 Comment
Resource
• Math
• K-2, 3-5, MS
Common Core
<p>Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy?</p>Aligned to...