Math
posted by Peter .
My son is grade 4
his homework have question is :
when you multiply any number by 1,what is the product ?
Please help !!!!

The product is the other number.
1 * 2 = 2
1 * 5 = 5
1 * 10 = 10 
lol wtf? 4th grade?

This is
Identity property of multiplication
states that the product of 1 and any number or variable is the number or variable itself. For example, 4 × 1 = 4,  11 × 1 =  11,
The teacher is probably trying to help them learn this particular property.
You are a great parent by the way!!! 
the product of any number and one is the number being multiplied by one for example 1*1=1
2*1=2
3*1=3
4*1=4
5*1=5