diff --git a/src/Perl6/Grammar.pm b/src/Perl6/Grammar.pm
index 8ccdd0ae7a3..9be494818bf 100644
--- a/src/Perl6/Grammar.pm
+++ b/src/Perl6/Grammar.pm
@@ -1821,6 +1821,8 @@ token prefix:sym<|>   { <sym>  <O('%symbolic_unary')> }
 token infix:sym<*>    { <sym>  <O('%multiplicative')> }
 token infix:sym</>    { <sym>  <O('%multiplicative')> }
 token infix:sym<div>  { <sym> >> <O('%multiplicative')> }
+token infix:sym<gcd>  { <sym> >> <O('%multiplicative')> }
+token infix:sym<lcm>  { <sym> >> <O('%multiplicative')> }
 token infix:sym<%>    { <sym>  <O('%multiplicative')> }
 token infix:sym<mod>  { <sym> >> <O('%multiplicative')> }
 token infix:sym<%%>   { <sym>  <O('%multiplicative, :iffy<1>')> }
diff --git a/src/core/Int.pm b/src/core/Int.pm
index 93b689471d2..fdf1983f5fe 100644
--- a/src/core/Int.pm
+++ b/src/core/Int.pm
@@ -104,6 +104,14 @@ our multi sub infix:<div>(Int $a, Int $b) {
     upgrade_to_num_if_needed(pir::fdiv__NNN($a, $b));
 }
 
+our multi sub infix:<gcd>(Int $a, Int $b) {
+    pir::gcd__Iii($a, $b)
+}
+
+our multi sub infix:<lcm>(Int $a, Int $b) {
+    pir::lcm__Iii($a, $b)
+}
+
 our multi sub infix:<%>(Int $a, Int $b) {
     upgrade_to_num_if_needed(pir::mod__NNN($a, $b))
 }
diff --git a/src/core/Rat.pm b/src/core/Rat.pm
index d4da7ca6ea0..fbf718546e0 100644
--- a/src/core/Rat.pm
+++ b/src/core/Rat.pm
@@ -13,7 +13,7 @@ class Rat is Cool does Real {
             $numerator = -$numerator;
             $denominator = -$denominator;
         }
-        my $gcd = $numerator.gcd($denominator);
+        my $gcd = $numerator gcd $denominator;
         $numerator = $numerator div $gcd;
         $denominator = $denominator div $gcd;
         self.bless(*, :numerator($numerator), :denominator($denominator));
@@ -51,7 +51,7 @@ multi sub prefix:<->(Rat $a) {
 }
 
 multi sub infix:<+>(Rat $a, Rat $b) {
-    my $gcd = $a.denominator.gcd($b.denominator);
+    my $gcd = $a.denominator gcd $b.denominator;
     ($a.numerator * ($b.denominator div $gcd) + $b.numerator * ($a.denominator div $gcd))
         / (($a.denominator div $gcd) * $b.denominator);
 }
@@ -65,7 +65,7 @@ multi sub infix:<+>(Int $a, Rat $b) {
 }
 
 multi sub infix:<->(Rat $a, Rat $b) {
-    my $gcd = $a.denominator.gcd($b.denominator);
+    my $gcd = $a.denominator gcd $b.denominator;
     ($a.numerator * ($b.denominator div $gcd) - $b.numerator * ($a.denominator div $gcd))
         / (($a.denominator div $gcd) * $b.denominator);
 }