Here we have a set of number tracks with four numbers in each. Just fill the gaps so the number tracks are complete. A little bit harder than the 3 number tracks as two numbers in a row are missing on some of them. Elephants have great memories so no problems for them!

Here we have a set of number tracks with five numbers in each. Just fill the gaps so the number tracks are complete. Only one number missing in each line. Can the dinosaurs remember that far back?

Here we have a set of number tracks with five numbers in each. Just fill the gaps so the number tracks are complete. A little bit harder than before as several numbers in a row are missing on some of them.

Estimating on a 0-5 number line.