Abstract: A handle for measuring wheel includes a supporting section having a wheel support provided at a lower end thereof; a telescoping section movably connected to a first side of the supporting section, and having a plurality of longitudinally spaced locating holes; a locating unit provided on the supporting section at a predetermined position thereof, and including an elastic portion attached to an opposite second side of the supporting section, a pull tab outward extended from an outer side of the elastic portion, and a stopper located opposite to the pull tab to normally releasably engage with one of the locating holes on the telescoping section; and a wheel rotatably mounted to the wheel support. When the pull tab is pulled to disengage the stopper from the locating hole, the telescoping section may be freely slid to a desired height relative to the supporting section.

Abstract: A building block includes two perpendicularly connected square frames, and a hypotenuse frame extended between outer edges of the two square frames. Each of the square and hypotenuse frames has an outer frame portion and an inner cross-shaped rib portion having a thickness twice as large as that of the outer frame portion. The cross-shaped rib portion divides a space enclosed in each frame into four equal divisions, which are four cavities on one of the two square frames; two diagonally opposite round connecting posts and two diagonally opposite cavities on the other square frame; and two diagonally opposite connecting protrusions and two diagonally opposite rectangular cavities on the hypotenuse frame, so that a plurality of the building blocks could be assembled together in different manners to form changeful shapes via engagement of the cavities with corresponding connecting posts or protrusions.

Abstract: A teach-aiding weight set includes a white, a red, a light green, a purple, a yellow, a green, a black, a brown, a blue, and an orange weight. Each of the weights is provided with spaced shallow grooves to show a plurality of equal sections corresponding to a specific weight thereof. The specific color, weight, and shallow-groove-divided sections of each of the weights help small children to learn primary mathematical concepts, particularly the concept of weight.