Year 2 Explaining, convincing and proving

Try out this number trick. What happens with different starting numbers? What do you notice?

Four bags contain a large number of 1s, 3s, 5s and 7s. Can you pick ten numbers from the bags so that their total is 37?

How many possible symmetrical necklaces can you find? How do you know you've found them all?

This problem looks at how one example of your choice can show something about the general structure of multiplication.