you can use this :

```
70 => __('seventy', 'math-captcha'),
71 => __('seventy one', 'math-captcha'),
72 => __('seventy two', 'math-captcha'),
73 => __('seventy three', 'math-captcha'),
74 => __('seventy four', 'math-captcha'),
75 => __('seventy five', 'math-captcha'),
76 => __('seventy six', 'math-captcha'),
77 => __('seventy seven', 'math-captcha'),
78 => __('seventy eight', 'math-captcha'),
79 => __('seventy nine', 'math-captcha'),
80 => __('eighty', 'math-captcha'),
90 => __('ninety', 'math-captcha'),
91 => __('ninety one', 'math-captcha'),
92 => __('ninety two', 'math-captcha'),
93 => __('ninety three', 'math-captcha'),
94 => __('ninety four', 'math-captcha'),
95 => __('ninety five', 'math-captcha'),
96 => __('ninety six', 'math-captcha'),
97 => __('ninety seven', 'math-captcha'),
98 => __('ninety eight', 'math-captcha'),
99 => __('ninety nine', 'math-captcha')
```

but you must retranslate all languages...

you can add to :

switch(get_bloginfo('language'))

{

case 'fr-FR':

}

but i'm not very good in php if you want i can help you i'm motivated