"What color is the toy?" - "The toy is green"

please help me out, check if my translation is correct

welke kleur is het speelgoed? - Het speelgoed is wit groen (if you are refering to the title of this post) 

also, "how many toys are there? - there are three toys" and "Let's count the toys"

hoe veel hoeveel speelgoed zijn is er? - er zijn 3 speeltjes

Laten we tellen het speelgoed tellen

also, if you can think of most common appreciation phrases in Dutch, the ones a teacher would typically use in a classroom, please tell me which they are

My son in 5 and he is going to a Dutch school soon here in Amsterdam, I just want him to know at least a few most commonly used phrases he is going to hear in the classroom

What is your name? = Hoe heet jij?

My name is ... = Mijn naam is ...

How old are you? = Hoe oud ben jij?

I am ... years old. = Ik ben ... jaar (oud).

Do you want to play with me? = Wil je met me spelen?

Succes!