There are so many kind of manipulation that daycare children usually use like lies, making excuse, use their charm, seeking for affection, hysterically, blame other peer or make some kind of threat. You should recognize what is the reason of their manipulative behavior to reduce or eliminate it. They may do it to avoid your task, feel embarrassed or other reason. Encourage the daycare children to use a direct language to state their meaning.
If you can ask them to get use with direct language, it will automatically reduce their manipulative action like using their charm or hysterically crying to ask something. Showing them that you run the daycare based on rules. It does not mean that you have to strictly push them to follow your rules just to be suffering. You can explain further that it is for their own sake. Manipulative children often said that their wrong deed is allowed by their parent when you forbid them.
By straightly state the rules of your daycare that have to be obey by all children, they will reduce their manipulative ways that using their parent as comparison with you. Ask them whether they feel discomfort about something that makes them boost their tantrum or avoidance. You better said to them that they can speak what they want or ask your help anytime without hesitate or showing their manipulative strategy.
If you are handling daycare children that often lies, you better set a rule that they must quickly admit and ask for apologize every time they make a lies. Explain that blaming other people because of your vault is not a good thing. You can praise them by saying that they can do it or finish it without blaming the other. Try again with your support and they will get more self confidence to speak or act. Make a chart of daily daycare routine activity so that children will not blame the other for their unfinished job.
The most important thing to handle manipulative children is by showing your relax feeling and supportive. They often being manipulative because they are worried about their ability to finish your task scare to blame or difficulties to explain their willing. Be prepared since manipulative daycare children may test your patience with disobedience. Be nice but firm about your daycare rules so that they will understand that they do not need to be manipulative to get what they want.