SMART TRAY, Calculating Sets 1 and 2, Pack of 50

Improve calculating skills with these cards that use fun sums to demonstrate the four operations. 25 cards per set with 10 Smart Tray activities on each card.
Set 1: Cards start with simple activities based around addition and subtraction from 1 to 20.
Set 2: Cards advance calculating skills with numbers from 1 to 100.