Twenty numbers and four signs. That last part is what separates this from every other number set — alongside the tiles for 1 to 20 come a multiply, a plus, a minus and a divide, so a child does not just name a number, they build a whole sum on the table and read it back. Lay out 7, +, 5 and the question has been asked without a worksheet being printed.

The tiles are all the same square, in blue, yellow, red, green, orange, pink and purple, with the numeral in a contrasting colour on each — a black 1 on blue, a red 2 on yellow, a green 10 on red. Equal size is what lets a sum line up straight, and rotating colours is what stops a row of tiles reading as one block.

A word about the name printed on the banner. It reads SQUARE NUMBERS, which in mathematics means 1, 4, 9, 16 and so on. That is not what this set is. These are the numbers one to twenty on square tiles, and if you came looking for a squares-and-roots aid this is the wrong product. We would rather say that plainly than let a teacher order it by mistake.

For a classroom the set does three jobs. On the wall it is a number line to twenty. On a table it is a sum builder. In a tray it is a sorting and ordering game — hand out the tiles shuffled and ask a group to put them in order, which is a genuine test of number sense rather than recitation.

Nothing has adhesive on the back and no dimension is printed on the tiles or the banner, so we describe neither. Double-sided tape works for a wall display, and most buyers keep them loose the rest of the time. WhatsApp us and we will measure a tile from the stock in hand.

Safencia sells the set at Rs. 840 with Cash on Delivery throughout Pakistan, Lahore, Karachi, Islamabad and Rawalpindi included. Stock and your city's delivery charge are settled on WhatsApp before dispatch.

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