diff --git a/NEWS.md b/NEWS.md
index 02d24a095..ae3ed53ff 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -2,8 +2,9 @@
 
 # pillar 1.9.0.9008
 
-- Internal changes only.
+## Bug fixes
 
+- Math operations on `num()` objects now pass additional arguments to the mathematical function (@gvelasq, #660).
 
 # pillar 1.9.0.9007
 
diff --git a/R/num.R b/R/num.R
index 00dfeb66c..81179e10a 100644
--- a/R/num.R
+++ b/R/num.R
@@ -127,7 +127,7 @@ vec_arith.numeric.pillar_num <- vec_arith.pillar_num.default
 vec_math.pillar_num <- function(.fn, .x, ...) {
   "!!!!DEBUG vec_math(`v(.fn)`)"
 
-  out <- vec_math_base(.fn, vec_proxy(.x))
+  out <- vec_math_base(.fn, vec_proxy(.x), ...)
 
   if (is.numeric(out)) {
     out <- vec_restore(out, .x)
diff --git a/tests/testthat/_snaps/num.md b/tests/testthat/_snaps/num.md
index e4d684c4b..e9a0473c2 100644
--- a/tests/testthat/_snaps/num.md
+++ b/tests/testthat/_snaps/num.md
@@ -467,6 +467,11 @@
     Output
       <pillar_num{%}*100[3]>
       [1] 84.1 90.9 14.1
+    Code
+      sum(num(c(1:3, NA)), na.rm = TRUE)
+    Output
+      <pillar_num[1]>
+      [1] 6
 
 # formatting
 
diff --git a/tests/testthat/test-num.R b/tests/testthat/test-num.R
index 759bbb271..dd207ad48 100644
--- a/tests/testthat/test-num.R
+++ b/tests/testthat/test-num.R
@@ -170,6 +170,7 @@ test_that("mathematics", {
     min(num(1:3, label = "$"))
     mean(num(1:3, notation = "eng"))
     sin(num(1:3, label = "%", scale = 100))
+    sum(num(c(1:3, NA)), na.rm = TRUE)
   })
 })