diff --git a/src/main.rs b/src/main.rs
index 2bc89f2..368ef3d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -54,7 +54,7 @@ pub fn get_significant_digits(n: &Float) -> usize {
             break;
         }
 
-        if !raw_string[i..raw_string.len()].contains(|c| matches!(c, '1'..'9')) {
+        if !raw_string[i..raw_string.len()].contains(|c| matches!(c, '1'..='9')) {
             significant_digits = i;
             break;
         }
@@ -69,7 +69,10 @@ fn test_get_significant_digits() {
     assert_eq!(many_zeros.to_f64(), 117.48139);
     let many_nines = parse_and_calc("12.0096 + 15.9994 * 2");
     assert_eq!(many_nines.to_f64(), 44.0084);
+    let zero_nine_zero = parse_and_calc("2+12321(5+123)");
+    assert_eq!(zero_nine_zero.to_f64(), 1577090.0);
 
     assert_eq!(get_significant_digits(&many_zeros), 8);
     assert_eq!(get_significant_digits(&many_nines), 6);
+    assert_eq!(get_significant_digits(&zero_nine_zero), 6);
 }