diff --git a/spec/values/calculation/abs.hrx b/spec/values/calculation/abs.hrx
index 907e29809..f875034d9 100644
--- a/spec/values/calculation/abs.hrx
+++ b/spec/values/calculation/abs.hrx
@@ -64,6 +64,17 @@ a {
   b: 2px;
 }
 
+<===> preserves_single_unit/warning
+DEPRECATION WARNING: In future versions of Sass, abs() will be interpreted as the CSS abs() calculation. This doesn't allow unitless numbers to be mixed with numbers with units. If you want to use the Sass function, call math.abs() instead.
+
+See https://sass-lang.com/d/import
+
+  ,
+1 | a {b: abs(1 + 1px)}
+  |           ^^^^^^^
+  '
+    input.scss 1:11  root stylesheet
+
 <===>
 ================================================================================
 <===> sass_script/input.scss
diff --git a/spec/values/calculation/max.hrx b/spec/values/calculation/max.hrx
index cbcef327b..40bb421e7 100644
--- a/spec/values/calculation/max.hrx
+++ b/spec/values/calculation/max.hrx
@@ -211,6 +211,17 @@ a {
   b: 3.4px;
 }
 
+<===> simplified/operation/unitless_and_real/warning
+DEPRECATION WARNING: In future versions of Sass, max() will be interpreted as the CSS max() calculation. This doesn't allow unitless numbers to be mixed with numbers with units. If you want to use the Sass function, call math.max() instead.
+
+See https://sass-lang.com/d/import
+
+  ,
+1 | a {b: max(1px, 2.5 + 0.9px)}
+  |                ^^^^^^^^^^^
+  '
+    input.scss 1:16  root stylesheet
+
 <===>
 ================================================================================
 <===> preserved/math/first/input.scss
@@ -292,6 +303,17 @@ a {
   b: max(1%, 3.4px);
 }
 
+<===> preserved/operation/unitless_and_real/plus/warning
+DEPRECATION WARNING: In future versions of Sass, max() will be interpreted as the CSS max() calculation. This doesn't allow unitless numbers to be mixed with numbers with units. If you want to use the Sass function, call math.max() instead.
+
+See https://sass-lang.com/d/import
+
+  ,
+1 | a {b: max(1%, 2.5 + 0.9px)}
+  |               ^^^^^^^^^^^
+  '
+    input.scss 1:15  root stylesheet
+
 <===>
 ================================================================================
 <===> preserved/operation/unitless_and_real/minus/input.scss
@@ -302,6 +324,17 @@ a {
   b: max(1%, 1.6px);
 }
 
+<===> preserved/operation/unitless_and_real/minus/warning
+DEPRECATION WARNING: In future versions of Sass, max() will be interpreted as the CSS max() calculation. This doesn't allow unitless numbers to be mixed with numbers with units. If you want to use the Sass function, call math.max() instead.
+
+See https://sass-lang.com/d/import
+
+  ,
+1 | a {b: max(1%, 2.5 - 0.9px)}
+  |               ^^^^^^^^^^^
+  '
+    input.scss 1:15  root stylesheet
+
 <===>
 ================================================================================
 <===> preserved/operation/unitless_and_real/in_calc/input.scss
@@ -312,6 +345,17 @@ a {
   b: max(1%, 3.4px);
 }
 
+<===> preserved/operation/unitless_and_real/in_calc/warning
+DEPRECATION WARNING: In future versions of Sass, max() will be interpreted as the CSS max() calculation. This doesn't allow unitless numbers to be mixed with numbers with units. If you want to use the Sass function, call math.max() instead.
+
+See https://sass-lang.com/d/import
+
+  ,
+1 | a {b: calc(max(1%, 2.5 + 0.9px))}
+  |                    ^^^^^^^^^^^
+  '
+    input.scss 1:20  root stylesheet
+
 <===>
 ================================================================================
 <===> math/slash_as_division/input.scss
diff --git a/spec/values/calculation/min.hrx b/spec/values/calculation/min.hrx
index 9a121be89..0f28f7b8f 100644
--- a/spec/values/calculation/min.hrx
+++ b/spec/values/calculation/min.hrx
@@ -211,6 +211,17 @@ a {
   b: 1px;
 }
 
+<===> simplified/operation/unitless_and_real/warning
+DEPRECATION WARNING: In future versions of Sass, min() will be interpreted as the CSS min() calculation. This doesn't allow unitless numbers to be mixed with numbers with units. If you want to use the Sass function, call math.min() instead.
+
+See https://sass-lang.com/d/import
+
+  ,
+1 | a {b: min(1px, 2.5 + 0.9px)}
+  |                ^^^^^^^^^^^
+  '
+    input.scss 1:16  root stylesheet
+
 <===>
 ================================================================================
 <===> preserved/math/first/input.scss
@@ -292,6 +303,17 @@ a {
   b: min(1%, 3.4px);
 }
 
+<===> preserved/operation/unitless_and_real/plus/warning
+DEPRECATION WARNING: In future versions of Sass, min() will be interpreted as the CSS min() calculation. This doesn't allow unitless numbers to be mixed with numbers with units. If you want to use the Sass function, call math.min() instead.
+
+See https://sass-lang.com/d/import
+
+  ,
+1 | a {b: min(1%, 2.5 + 0.9px)}
+  |               ^^^^^^^^^^^
+  '
+    input.scss 1:15  root stylesheet
+
 <===>
 ================================================================================
 <===> preserved/operation/unitless_and_real/minus/input.scss
@@ -302,6 +324,17 @@ a {
   b: min(1%, 1.6px);
 }
 
+<===> preserved/operation/unitless_and_real/minus/warning
+DEPRECATION WARNING: In future versions of Sass, min() will be interpreted as the CSS min() calculation. This doesn't allow unitless numbers to be mixed with numbers with units. If you want to use the Sass function, call math.min() instead.
+
+See https://sass-lang.com/d/import
+
+  ,
+1 | a {b: min(1%, 2.5 - 0.9px)}
+  |               ^^^^^^^^^^^
+  '
+    input.scss 1:15  root stylesheet
+
 <===>
 ================================================================================
 <===> preserved/operation/unitless_and_real/in_calc/input.scss
@@ -312,6 +345,17 @@ a {
   b: min(1%, 3.4px);
 }
 
+<===> preserved/operation/unitless_and_real/in_calc/warning
+DEPRECATION WARNING: In future versions of Sass, min() will be interpreted as the CSS min() calculation. This doesn't allow unitless numbers to be mixed with numbers with units. If you want to use the Sass function, call math.min() instead.
+
+See https://sass-lang.com/d/import
+
+  ,
+1 | a {b: calc(min(1%, 2.5 + 0.9px))}
+  |                    ^^^^^^^^^^^
+  '
+    input.scss 1:20  root stylesheet
+
 <===>
 ================================================================================
 <===> math/slash_as_division/input.scss
diff --git a/spec/values/calculation/round/error.hrx b/spec/values/calculation/round/error.hrx
index 3906d43b7..9250cb28e 100644
--- a/spec/values/calculation/round/error.hrx
+++ b/spec/values/calculation/round/error.hrx
@@ -52,19 +52,6 @@ Error: $number: var(--c) is not a number.
   '
   input.scss 1:7  root stylesheet
 
-<===>
-================================================================================
-<===> one_argument/unsimplifiable/input.scss
-a {b: round(1px + 2px - var(--c))}
-
-<===> one_argument/unsimplifiable/error
-Error: Single argument 3px - var(--c) expected to be simplifiable.
-  ,
-1 | a {b: round(1px + 2px - var(--c))}
-  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^
-  '
-  input.scss 1:7  root stylesheet
-
 <===>
 ================================================================================
 <===> one_argument/type/input.scss
diff --git a/spec/values/calculation/round/one_argument.hrx b/spec/values/calculation/round/one_argument.hrx
index 099bfc653..c24cb22b9 100644
--- a/spec/values/calculation/round/one_argument.hrx
+++ b/spec/values/calculation/round/one_argument.hrx
@@ -42,6 +42,17 @@ a {
   b: -2px;
 }
 
+<===> preserves_units/warning
+DEPRECATION WARNING: In future versions of Sass, round() will be interpreted as a CSS round() calculation. This requires an explicit modulus when rounding numbers with units. If you want to use the Sass function, call math.round() instead.
+
+See https://sass-lang.com/d/import
+
+  ,
+1 | a {b: round(-7px / 4em) * 1em}
+  |       ^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:7  root stylesheet
+
 <===>
 ================================================================================
 <===> preserves_single_unit/input.scss
@@ -52,6 +63,27 @@ a {
   b: 2px;
 }
 
+<===> preserves_single_unit/warning
+DEPRECATION WARNING: In future versions of Sass, round() will be interpreted as the CSS round() calculation. This doesn't allow unitless numbers to be mixed with numbers with units. If you want to use the Sass function, call math.round() instead.
+
+See https://sass-lang.com/d/import
+
+  ,
+1 | a {b: round(1 + 1px)}
+  |             ^^^^^^^
+  '
+    input.scss 1:13  root stylesheet
+
+DEPRECATION WARNING: In future versions of Sass, round() will be interpreted as a CSS round() calculation. This requires an explicit modulus when rounding numbers with units. If you want to use the Sass function, call math.round() instead.
+
+See https://sass-lang.com/d/import
+
+  ,
+1 | a {b: round(1 + 1px)}
+  |       ^^^^^^^^^^^^^^
+  '
+    input.scss 1:7  root stylesheet
+
 <===>
 ================================================================================
 <===> preserved/variable/input.scss
@@ -128,3 +160,13 @@ a {b: round(1.1)}
 a {
   b: 1.1;
 }
+
+<===>
+================================================================================
+<===> unsimplifiable/input.scss
+a {b: round(1px + 2px - var(--c))}
+
+<===> unsimplifiable/output.css
+a {
+  b: round(3px - var(--c));
+}