# multiples year 4

• Nov 6th 2008, 09:34 AM
JB Kidd
multiples year 4
Hi, my son has come home with some homework, which i have not come across before with him, I will give 3 examples:-

Find the number below 50, a multiple of 4 the sum of its didgits is 5
a 2 - digit number a multiple of 7 the product of it's digits is 16
a square number below 50, the sum of its digits is 9

I was hoping someone can explain these to me so I can explain to my son thank you:-)
• Nov 6th 2008, 10:22 AM
Soroban
Hello, JB Kidd!

At "Year 4", a simple listing is probably expected.

Quote:

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: . $\begin{Bmatrix}14 \\ 23 \\ 32 \\ 41 \\ 50 \end{Bmatrix}$

Only one is a multiple of 4: .32

Quote:

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: . $\begin{Bmatrix}28 \\ 44 \\ 82 \end{Bmatrix}$

Only one is a multiple of 7: .28

Quote:

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

We have a two-digit square number below 50.

Thre are four such numbers: . $\begin{Bmatrix} 16 \\ 25 \\ 36 \\ 49 \end{Bmatrix}$

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