Year 1 arithmetic worksheet which changes numbers each time you open it. A simple worksheet with ten questions ideal for daily arithmetic practice or homework sheets. Each time you open the worksheet in Excel the numbers change so you can open and print it as many times as you like and the worksheet will be different each time! Content included: Addition within 10 Number bonds to 10 Doubles to 20 Halves to 20 Addition crossing 10s Subtraction within 20 (not crossing 10s) Adding onto teens numbers Subtraction crossing 10s Number bonds to 20 Partitioning teens numbers