Abstract: A toy includes a casing having a number of holes formed in an upper surface. A board which has a number of symbols printed on an upper surface is insertable into the bottom of the casing. A number of blocks, each can be inserted into a hole. An opening is formed in each of the blocks. A tongue is formed on each of the blocks and is engageable within the opening of another block so that the blocks can be assembled together. A numeral is printed on each of the tongues. Children can select and insert a block into a hole which has a numeral identical to that of the block so that the toy can also be used as a teaching aid.

Abstract: A children's educational apparatus comprising a driving member and a control member. The driving member includes a driving roll and two driven rolls, all which rotate together. A set of cards is set on each of the driven rolls, cards in one set being printed with mathematical questions and cards in the other set being printed with the solutions corresponding to those questions. The control member includes pressing keys on a keyboard, each of which is marked with a number on the upper face thereof and connects to a keying arm. When pressing the keys on which correct members corresponding to solutions of the mathematical questions are marked, the keying arms will be forced to move, thus forcing a pushing element to push the driving roll to rotate, then changing the cards to the next one.