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Extending MadeInGermany's appoach by sym[six]=6 and after running his code in bash 4 as required, try
echo $((out))
1690Or, try
echo $out | bc
1690

With bash-4 it's a piece of cake:
#!/bin/bash
# bash-4 required
declare -A sym
sym=(
[zero]=0
[one]=1
[two]=2
[three]=3
[four]=4
[five]=5
[plus]=+
)

while read -r -a words
do
...

Hi azaiie...

This sounds easy, but is much more difficult than you think using a fully POSIX compliant shell.
This is fully POSIX compliant and gets 39 individual words into individual variables...

Try this slight modification to your attempt:

for i in file[1-4]
do read -r line
if [ "$i" == "test" ]
then continue
fi
echo $line >> $i
done < test