diff --git a/m.js b/m.js
index 341dbd4..e2914fb 100644
--- a/m.js
+++ b/m.js
@@ -36,13 +36,18 @@ const M =
     },
     Single:
     {
-        Affine: (inV, inMatrix)=> inMatrix.map(row=> row.reduce((sum, current, index)=> sum + current*inV[index]))
+        Subtract:    (inV1, inV2)=> inV1.map((component, i)=> component-inV2[i]),
+        Multiply:    (inV1, inV2)=> inV1.map((component, i)=> component*inV2[i]),
+          Affine: (inV, inMatrix)=> inMatrix.map(row=> row.reduce((sum, current, index)=> sum + current*inV[index]))
     },
     Batch:
     {
-            Affine: (inCloud, inMatrix)=> inCloud.map(row=> M.Single.Affine(row, inMatrix)),
-           Sigmoid:           (inCloud)=> M.Iterate.Old(inCloud, i=>1/(1+Math.Pow(Math.E, i))),
-        Derivative:           (inCloud)=> M.Iterate.Old(inCloud, i=>i*(1-i))
+          Subtract: (inCloud1, inCloud2)=> inCloud1.map((row, rowIndex)=> M.Single.Subtract(row, inCloud2[rowIndex])),
+          Multiply: (inCloud1, inCloud2)=> inCloud1.map((row, rowIndex)=> M.Single.Multiply(row, inCloud2[rowIndex])),
+            Affine:  (inCloud, inMatrix)=> inCloud.map(row=> M.Single.Affine(row, inMatrix)),
+           Sigmoid:            (inCloud)=> M.Iterate.Old(inCloud, i=>1/(1+Math.Pow(Math.E, i))),
+        Derivative:            (inCloud)=> M.Iterate.Old(inCloud, i=>i*(1-i)),
+             Scale:  (inCloud, inScalar)=> M.Iterate.Old(inCloud, i=>i*inScalar)
     }
 }
 
diff --git a/m.test.js b/m.test.js
index dfb4a1d..823298d 100644
--- a/m.test.js
+++ b/m.test.js
@@ -96,6 +96,28 @@ Deno.test("Single.Affine", ()=>
     assertEquals(t[1], 1.1, "correct placement");
 });
 
+Deno.test("Single.Subtract", ()=>
+{
+    let v1 = [1, 2];
+    let v2 = [3, 4];
+    let t = M.Single.Subtract(v1, v2);
+    assertEquals(t.length, 2, "correct dimensions");
+    assertEquals(t[0], -2)
+    assertEquals(t[1], -2, "correct placement");
+});
+
+Deno.test("Single.Multiply", ()=>
+{
+    let v1 = [1, 2];
+    let v2 = [3, 4];
+    let t = M.Single.Multiply(v1, v2);
+    assertEquals(t.length, 2, "correct dimensions");
+    assertEquals(t[0], 3)
+    assertEquals(t[1], 8, "correct placement");
+});
+
+
+
 Deno.test("Batch.Affine", ()=>
 {
     let c = [[1, 2], [3, 4]];
@@ -105,3 +127,14 @@ Deno.test("Batch.Affine", ()=>
     assertEquals(t[0].length, 2, "correct dimensions")
     assertEquals(t[0][1], 1.1, "correct placement");
 });
+
+Deno.test("Batch.Scale", ()=>
+{
+    let c = [[1, 2], [3, 4]];
+    let s = 0.5;
+    let t = M.Batch.Scale(c, s);
+    assertEquals(t.length, 2, "correct count");
+    assertEquals(t[0].length, 2, "correct dimensions");
+    console.log(t);
+    assertEquals(t[1][0], 1.5, "correct placement");
+});
diff --git a/methods.md b/methods.md
index 2c4f9bc..b149d13 100644
--- a/methods.md
+++ b/methods.md
@@ -6,12 +6,9 @@ clone(inCloud) // done
 pad(inCloud) // done
 unpad(inCloud) // done
 
-// batch filter
 transform(inCloud, inMatrix) // done
 sigmoid(inCloud) // 1/(1+e^x) //
-derivative(inCloud) // x*(1-x)
-scale(inCloud1, inV)
-
-// batch of pairs
-subtract(inCloud1, inCloud2)
-multiply(inCloud1, inCloud2) 
\ No newline at end of file
+derivative(inCloud) // x*(1-x) //
+scale(inCloud1, inV) //
+subtract(inCloud1, inCloud2) // done
+multiply(inCloud1, inCloud2) // done
\ No newline at end of file