Roller Digital Teaching Stamp Multiply Divide Addition Subtraction Maths Reusable Calculation Educational Exercises within 100

Roller Digital Teaching Stamp Multiply Divide Addition Subtraction Maths Reusable Calculation Educational Exercises Within 100
addition, subtraction, multiplication and division
1. Open the oil cap
2. The oil nozzle is aligned with the oil hole and 5.6 drops can be dropped
3. Add the oil cap and cover it