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Math Help - multiples year 4

  1. #1
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    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:-)
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  2. #2
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    Hello, JB Kidd!

    At "Year 4", a simple listing is 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: . \begin{Bmatrix}14 \\ 23 \\ 32 \\ 41 \\ 50 \end{Bmatrix}

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

    Only one is a multiple of 7: .28




    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

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