Grouping Goodies

Pat counts her sweets in different groups and both times she has some left over. How many sweets could she have had?

What Number?

I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number.

Odd Tic Tac

An odd version of tic tac toe

Ring a Ring of Numbers

Stage: 1 Challenge Level:

Choose four of the numbers from this list: $1, 2, 3, 4, 5, 6, 7, 8, 9$ to put in the squares below so that the difference between joined squares is odd.
Only one number is allowed in each square. You must use four different numbers.
What can you say about the sum of each pair of joined squares?
What must you do to make the difference even?
What do you notice about the sum of the pairs now?

Here are some sheets for recording your solutions.

Full size version
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