Seriation is putting things in size order, either big-to-small or small-to-big. Children need to learn this concept of looking at something and picking out which item is bigger or smaller. Be sure to go in the same order each time. (Always from bigger to smaller or the other way, but don’t go back and forth. Keep it clear for them.) When teaching seriation, it’s best to use all the same color items. When teaching size or quantity, lots of color can confuse the children as to exactly what you are comparing. If the items being compared are all the same color, the child is clear it is size that is being differentiated.
To prepare for the two steps in teaching seriation, you will need a big square and a little square. You can use a brightly colored cardboard box. (You may be able to get some free from a grocery store.) Cut out a big square and a little square.
The First Step in Teaching Seriation