You may also like  problem icon  Number Round Up   problem icon
Numbers as Shapes   problem icon  Pairs of Numbers  If you have
ten counters numbered 1 to 10, how many can you put into pairs
that add to 10? Which ones do you have to leave out? Why?  How
Odd  You might find it useful to have some cubes or a number
line, or you could draw your own number line. How will you make
sure you don't forget what you've found out?