math.ps1

#   .SYNOPSIS
#       Generate math worksheets randomly.
#
#   .DESCRIPTION
#       Used to generate addition, subtraction, and multiplication worksheets. Can generate math problems that are
#       1, 2, or 3 digits long. The Carry switch determines if 'number carrying' is used or not.
#
#   .PARAMETER Digits
#       Specifies the number of digits to use for the math problems. Minimum value is 1. Maximum value is 3. Default is 1.
#
#   .PARAMETER Operation
#       Specifies the operation for the generated math problems. Valid selections are: Addition, Subtraction, or Multiplication.
#       When Multiplication is selected, only 4 rows of problems are generated in order to provide extra space for problem solving.
#
#       If parameter value is not specified, Addition problems are generated.
#
#   .PARAMETER Carry
#       Specifies that 'number carrying' operations can be used.
#
#   .NOTES
#        Author: Joshua Beckman
#        Editor: Anthony Franca
#       Version: 2019.09.20
#       Purpose: Educational
#
#   .LINK
#       https://www.dowst.dev/homework-double-digit-addition-without-carrying/

param(
    [parameter(Mandatory = $false)]
    [ValidateRange(1,3)][int]$Digits = 1,
    [parameter(Mandatory = $false)]
    [ValidateSet("Addition","Subtraction","Multiplication")][string]$Operation = "Addition",
    [parameter(Mandatory = $false)]
    [switch]$Carry
)

[System.Collections.Generic.List[PSObject]] $page = @()
$j = 0
$blank120 = "<td height=""120""> </td>`n" * 9
$blank75 = "<td height=""75""> </td>`n" * 9
$blank52 = "<td height=""52""> </td>`n" * 9
$blank20 = "<td height=""20""><br></td>`n" * 9
If($Operation -eq "Addition" -OR $Operation -eq "Subtraction"){$Count = 5}
If($Operation -eq "Multiplication"){$Count = 4}
while($j -lt $Count){
    [System.Collections.Generic.List[PSObject]] $rowA = @()
    [System.Collections.Generic.List[PSObject]] $rowB = @()
    $i=0
    while($i -lt 5){
        If($Digits -ge 1){
            $a = Get-Random -Minimum 1 -Maximum 10
            If($Operation -eq "Subtraction"){
                $b = Get-Random -Minimum 0 -Maximum $a
            }ElseIf($Operation -eq "Addition"){
                If($Carry -eq $true){
                    $b = Get-Random -Minimum 0 -Maximum 10
                }Else{
                    $b = Get-Random -Minimum 0 -Maximum (9-$a+1)
                }
            }ElseIf($Operation -eq "Multiplication"){
                $b = Get-Random -Minimum 1 -Maximum 10
            }
        }
        If($Digits -ge 2){
            $c = Get-Random -Minimum 1 -Maximum 10
            If($Operation -eq "Subtraction"){
                If($Carry -eq $true){
                    $d = Get-Random -Minimum 0 -Maximum 10
                }Else{
                    $d = Get-Random -Minimum 0 -Maximum $c
                }
            }ElseIf($Operation -eq "Addition"){
                If($Carry -eq $true){
                    $d = Get-Random -Minimum 0 -Maximum 10
                }Else{
                    $d = Get-Random -Minimum 0 -Maximum (9-$c+1)
                }
            }ElseIf($Operation -eq "Multiplication"){
                $d = Get-Random -Minimum 1 -Maximum 10
            }
        }
        If($Digits -ge 3){
            $e = Get-Random -Minimum 1 -Maximum 10
            If($Operation -eq "Subtraction"){
                If($Carry -eq $true){
                    $f = Get-Random -Minimum 0 -Maximum 10
                }Else{
                    $f = Get-Random -Minimum 0 -Maximum $e
                }
            }ElseIf($Operation -eq "Addition"){
                If($Carry -eq $true){
                    $f = Get-Random -Minimum 0 -Maximum 10
                }Else{
                    $f = Get-Random -Minimum 0 -Maximum (9-$e+1)
                }
            }ElseIf($Operation -eq "Multiplication"){
                $f = Get-Random -Minimum 1 -Maximum 10
            }
        }
        if(($b + $d) -gt 0){
            if($b -eq 0){$b=' '}
            $rowA.Add("<td class=""xl66"" height=""52"" width=""115"">$a$c$e</td>`n")
            If($Operation -eq "Addition"){
                $rowB.Add("<td class=""xl65"" height=""52"" width=""115"">+ $b$d$f</td>`n")
            }ElseIf($Operation -eq "Subtraction"){
                $rowB.Add("<td class=""xl65"" height=""52"" width=""115"">- $b$d$f</td>`n")
            }ElseIf($Operation -eq "Multiplication"){
                $rowB.Add("<td class=""xl65"" height=""52"" width=""115"">x $b$d$f</td>`n")
            }
            $i++
        }
    }

    $tableRows = New-Object System.Text.StringBuilder
    $tableRows.Append('<tr height="52">') | Out-Null
    $tableRows.Append($rowA -join('<td class="xl66" width="15"><br>')) | Out-Null
    $tableRows.Append('</tr><tr height="52">') | Out-Null
    $tableRows.Append($rowB -join('<td class="xl66" width="15"><br>')) | Out-Null
    If($Operation -eq "Multiplication"){
        $tableRows.Append("</tr><tr height=""52"">$blank120</tr>") | Out-Null
    }Else{
        $tableRows.Append("</tr><tr height=""52"">$blank75</tr>") | Out-Null
    }
    $page.Add($tableRows.ToString())
    $j++
}

If($Operation -eq "Addition"){
    $bodyTop = @'
    <html><head><title>Addition</title><style>.xl65{mso-style-parent:style0;font-size:36.0pt;mso-number-format:"\@";
    text-align:right;border-top:none;border-right:none;border-bottom:1.5pt solid blue;border-left:none;color:blue}
    .xl66{mso-style-parent:style0;font-size:36.0pt;mso-number-format:"\@";text-align:right;color:blue}</style></head><body>
    <table style="text-align: left; width: 635px; height: 60px;" border="0" cellpadding="0" cellspacing="0"><tbody>
'@
}ElseIf($Operation -eq "Subtraction"){
    $bodyTop = @'
    <html><head><title>Subtraction</title><style>.xl65{mso-style-parent:style0;font-size:36.0pt;mso-number-format:"\@";
    text-align:right;border-top:none;border-right:none;border-bottom:1.5pt solid blue;border-left:none;color:blue}
    .xl66{mso-style-parent:style0;font-size:36.0pt;mso-number-format:"\@";text-align:right;color:blue}</style></head><body>
    <table style="text-align: left; width: 635px; height: 60px;" border="0" cellpadding="0" cellspacing="0"><tbody>
'@
}ElseIf($Operation -eq "Multiplication"){
    $bodyTop = @'
    <html><head><title>Multiplication</title><style>.xl65{mso-style-parent:style0;font-size:36.0pt;mso-number-format:"\@";
    text-align:right;border-top:none;border-right:none;border-bottom:1.5pt solid blue;border-left:none;color:blue}
    .xl66{mso-style-parent:style0;font-size:36.0pt;mso-number-format:"\@";text-align:right;color:blue}</style></head><body>
    <table style="text-align: left; width: 635px; height: 60px;" border="0" cellpadding="0" cellspacing="0"><tbody>
'@
}

$bodyBotton = @'
</tbody></table><br><br></body></html>
'@
If($Operation -eq "Addition"){
    $bodyTop + $page -join("<tr height=""20"">$blank20</tr>") + $bodyBotton | out-file '.\addition.html'
}ElseIf($Operation -eq "Subtraction"){
    $bodyTop + $page -join("<tr height=""20"">$blank20</tr>") + $bodyBotton | out-file '.\subtraction.html'
}ElseIf($Operation -eq "Multiplication"){
    $bodyTop + $page -join("<tr height=""20"">$blank20</tr>") + $bodyBotton | out-file '.\multiplication.html'
}