Hello, JB Kidd!

At "Year 4", a simplelistingis probably expected.

1) Find a number below 50, a multiple of 4, the sum of its digits is 5.

We have a two-digit number, the sum of its digits is 5.

There are only five such numbers: .

Only one is a multiple of 4: .32

2) Find a 2-digit number, a multiple of 7, the product of its digits is 16

We have a two-digit number, the product of its digits is 16.

There are only three such numbers: .

Only one is a multiple of 7: .28

From "sum of its digits", I assume it is a3) Find a square number below 50, the sum of its digits is 9.two-digit number.

We have a two-digit square number below 50.

Thre are four such numbers: .

Only one has a digit-sum of 9: .36