Number lines can go up to any number, such as 10, 20, or even more! They help you to see where each number belongs and can be useful when adding and subtracting. Back to top.

To find out how number-line visualization relates to understanding, the researchers gave children a stack of blank number lines with "0" written on the left end and "20" on the right end.

Newborn babies seem to have a rudimentary sense of numbers, preferring smaller numbers on the left and larger ones on the right. The finding suggests that this left-to-right mental number line ...