diff --git a/gaboshlib/g_num_is_approx.sh b/gaboshlib/g_num_is_approx.sh
index 3b5ebf7..c206d14 100644
--- a/gaboshlib/g_num_is_approx.sh
+++ b/gaboshlib/g_num_is_approx.sh
@@ -10,8 +10,8 @@ function g_num_is_approx {
   
   g_num_valid_number "${f_num}" "${f_base}" "${f_percentage_up}" "${f_percentage_down}" || return 1
  
-  local f_from=$(echo "${f_base} - (${f_base} / 100 * ${f_percentage_down})" | bc -l)
-  local f_to=$(echo "${f_base} + (${f_base} / 100 * ${f_percentage_up})" | bc -l)
+  local f_from=$(g_calc "${f_base} - (${f_base} / 100 * ${f_percentage_down})")
+  local f_to=$(g_calc "${f_base} + (${f_base} / 100 * ${f_percentage_up})")
 
   g_num_is_between ${f_num} ${f_from} ${f_to}
 }