diff --git a/packages/dapp-svelte-wallet/api/package.json b/packages/dapp-svelte-wallet/api/package.json
index dcd7a414127..0880602f72b 100644
--- a/packages/dapp-svelte-wallet/api/package.json
+++ b/packages/dapp-svelte-wallet/api/package.json
@@ -27,8 +27,7 @@
   "dependencies": {
     "@agoric/eventual-send": "^0.12.0-dev.0",
     "@agoric/store": "^0.3.1-dev.0",
-    "esm": "^3.2.5",
-    "json5": "^2.1.3"
+    "esm": "^3.2.5"
   },
   "eslintConfig": {
     "extends": [
diff --git a/packages/dapp-svelte-wallet/api/src/lib-wallet.js b/packages/dapp-svelte-wallet/api/src/lib-wallet.js
index 803f3d3bd79..ae45e99d4a2 100644
--- a/packages/dapp-svelte-wallet/api/src/lib-wallet.js
+++ b/packages/dapp-svelte-wallet/api/src/lib-wallet.js
@@ -177,38 +177,6 @@ export async function makeWallet({
         purse,
         brand,
         actions: {
-          parseValue(str) {
-            const { amountMath, displayInfo } = brandTable.getByBrand(brand);
-            assert.typeof(
-              str,
-              'string',
-              details`stringValue ${str} is not a string`,
-            );
-
-            if (amountMath.getAmountMathKind() !== MathKind.NAT) {
-              // Punt to JSON5 parsing.
-              return JSON5.parse(str);
-            }
-
-            // Parse the string as a number.
-            const { decimalPlaces = 0 } = displayInfo || {};
-
-            const match = str.match(/^0*(\d+)(\.(\d*[1-9])?0*)?$/);
-            assert(
-              match,
-              details`${str} must be a non-negative decimal number`,
-            );
-
-            const unitstr = match[1];
-            const dec0str = match[3] || '';
-            const dec0str0 = dec0str.padEnd(decimalPlaces, '0');
-            assert(
-              dec0str0.length <= decimalPlaces,
-              details`${str} exceeds ${decimalPlaces} decimal places`,
-            );
-
-            return parseInt(`${unitstr}${dec0str0}`, 10);
-          },
           // Send a value from this purse.
           async send(receiverP, sendValue) {
             const { amountMath } = brandTable.getByBrand(brand);
@@ -634,7 +602,11 @@ export async function makeWallet({
             const purse = getPurse(pursePetname);
             purseKeywordRecord[keyword] = purse;
             const brand = purseToBrand.get(purse);
-            const amount = { brand, value };
+            const amount = {
+              brand,
+              value,
+              displayInfo: brandTable.getByBrand(brand).displayInfo,
+            };
             return [keyword, amount];
           },
         ),
diff --git a/packages/dapp-svelte-wallet/api/src/types.js b/packages/dapp-svelte-wallet/api/src/types.js
index 89495494886..9431b8d2add 100644
--- a/packages/dapp-svelte-wallet/api/src/types.js
+++ b/packages/dapp-svelte-wallet/api/src/types.js
@@ -18,6 +18,7 @@
  * @property {Petname} brandPetname
  * @property {Petname} pursePetname
  * @property {any} displayInfo
+ * @property {AmountMathKind} amountMathKind
  * @property {any} value
  * @property {any} currentAmountSlots
  * @property {any} currentAmount
diff --git a/packages/dapp-svelte-wallet/ui/package.json b/packages/dapp-svelte-wallet/ui/package.json
index 1a82c4d00d1..7f39e7fea05 100644
--- a/packages/dapp-svelte-wallet/ui/package.json
+++ b/packages/dapp-svelte-wallet/ui/package.json
@@ -16,6 +16,7 @@
     "@agoric/captp": "^1.5.2-dev.0",
     "@rollup/plugin-commonjs": "^12.0.0",
     "@rollup/plugin-node-resolve": "^8.0.0",
+    "json5": "^2.1.3",
     "livereload-js": "https://github.com/agoric-labs/livereload-js",
     "rollup": "^2.3.4",
     "rollup-plugin-livereload": "^1.0.0",
diff --git a/packages/dapp-svelte-wallet/ui/src/Amount.svelte b/packages/dapp-svelte-wallet/ui/src/Amount.svelte
index c1578c2e509..db63121b792 100644
--- a/packages/dapp-svelte-wallet/ui/src/Amount.svelte
+++ b/packages/dapp-svelte-wallet/ui/src/Amount.svelte
@@ -1,39 +1,14 @@
 <script>
   import Petname from "./Petname.svelte";
-  import Debug from "../lib/Debug.svelte";
   import Tooltip from "smelte/src/components/Tooltip";
+  import { stringifyValue } from './display';
 
   export let amount;
   export let displayInfo;
 
-  const CONVENTIONAL_DECIMAL_PLACES = 2;
-
   // The amount gets updated. Make this dynamic
   $: ({ brand, value } = amount);
-  const decimate = v => {
-    if (Array.isArray(v)) {
-      return `${v.length}`;
-    }
-    const { decimalPlaces = 0 } = displayInfo || {};
-
-    const bScale = BigInt(10) ** BigInt(decimalPlaces);
-    const bValue = BigInt(value);
-    const bDecimals = BigInt(bValue % bScale)
-    const bUnits = bValue / bScale;
-
-    // Convert 100 to '0000100'.
-    const dec0str0 = `${bDecimals}`.padStart(decimalPlaces, '0');
-    const dec0str = dec0str0.replace(/0+$/, '');
-
-    const decstr = dec0str.padEnd(CONVENTIONAL_DECIMAL_PLACES, '0');
-    const unitstr = `${bUnits}`;
-    if (!decstr) {
-      // No decimals to display.
-      return unitstr;
-    }
-
-    return `${unitstr}.${decstr}`;
-  };
+  const stringify = v => stringifyValue(v, displayInfo);
 </script>
 
 <style>
@@ -63,7 +38,7 @@
     </Tooltip>
   {:else}
     <b>
-      {decimate(value)}
+      {stringify(value)}
       <Petname name={brand.petname} />
     </b>
   {/if}
diff --git a/packages/dapp-svelte-wallet/ui/src/Transfer.svelte b/packages/dapp-svelte-wallet/ui/src/Transfer.svelte
index 6c680d19a87..7a83a5aade4 100644
--- a/packages/dapp-svelte-wallet/ui/src/Transfer.svelte
+++ b/packages/dapp-svelte-wallet/ui/src/Transfer.svelte
@@ -8,12 +8,13 @@
   import Button from "smelte/src/components/Button";
   import Dialog from "smelte/src/components/Dialog";
   import TextField from 'smelte/src/components/TextField';
+  import { RadioButton } from "smelte/src/components/RadioButton";
+  import Select from 'smelte/src/components/Select';
 
   import { contacts, purses } from './store';
   import DefaultButton from "../lib/DefaultButton.svelte";
   import CancelButton from "../lib/CancelButton.svelte";
-  import { RadioButton } from "smelte/src/components/RadioButton";
-  import Select from 'smelte/src/components/Select';
+  import { parseValue } from './display';
 
   export let source;
 
@@ -27,7 +28,7 @@
 
   const send = async destination => {
     try {
-      const parsed = await E(source.actions).parseValue(valueStr);
+      const parsed = parseValue(valueStr, source.displayInfo);
       showModal = false;
       await E(source.actions).send(destination.actions, parsed);
     } catch (e) {
diff --git a/packages/dapp-svelte-wallet/ui/src/display.js b/packages/dapp-svelte-wallet/ui/src/display.js
new file mode 100644
index 00000000000..90726fa43ef
--- /dev/null
+++ b/packages/dapp-svelte-wallet/ui/src/display.js
@@ -0,0 +1,93 @@
+// @ts-check
+import JSON5 from 'json5';
+import { assert, details } from '@agoric/assert';
+import { MathKind } from '@agoric/ertp';
+
+const CONVENTIONAL_DECIMAL_PLACES = 2;
+
+/**
+ * @typedef {{ amountMathKind?: AmountMathKind } & DisplayInfo} AmountDisplayInfo
+ */
+
+/**
+ * 
+ * @param {string} str 
+ * @param {AmountDisplayInfo} displayInfo 
+ */
+export function parseValue(str, displayInfo) {
+  const { amountMathKind = MathKind.NAT, decimalPlaces = 0 } = displayInfo || {};
+
+  assert.typeof(
+    str,
+    'string',
+    details`valueString ${str} is not a string`,
+  );
+
+  if (amountMathKind !== MathKind.NAT) {
+    // Punt to JSON5 parsing.
+    return JSON5.parse(str);
+  }
+
+  // Parse the string as a number.
+  const match = str.match(/^0*(\d+)(\.(\d*[1-9])?0*)?$/);
+  assert(
+    match,
+    details`${str} must be a non-negative decimal number`,
+  );
+
+  const unitstr = match[1];
+  const dec0str = match[3] || '';
+  const dec0str0 = dec0str.padEnd(decimalPlaces, '0');
+  assert(
+    dec0str0.length <= decimalPlaces,
+    details`${str} exceeds ${decimalPlaces} decimal places`,
+  );
+
+  return parseInt(`${unitstr}${dec0str0}`, 10);
+}
+
+/**
+ * 
+ * @param {any} value 
+ * @param {AmountDisplayInfo} [displayInfo]
+ * @returns {string}
+ */
+export function stringifyValue(value, displayInfo = undefined) {
+  const { amountMathKind = MathKind.NAT, decimalPlaces = 0 } = displayInfo || {};
+  
+  if (amountMathKind !== MathKind.NAT) {
+    // Just return the size of the set.
+    return `${value.length}`;
+  }
+
+  const bValue = BigInt(value);
+  if (!decimalPlaces) {
+    // Nothing else to do.
+    return `${bValue}`;
+  }
+
+  const bScale = BigInt(10) ** BigInt(decimalPlaces);
+
+  // Take integer division of the value by the scale.
+  const unitstr = `${bValue / bScale}`;
+
+  // Find the remainder of the value divided by the scale.
+  const bDecimals = BigInt(bValue % bScale)
+
+  // Create the decimal string.
+  const decstr = `${bDecimals}`
+    // Convert 100 to '0000100'.
+    .padStart(decimalPlaces, '0')
+    // Trim off trailing zeros.
+    .replace(/0+$/, '')
+    // Ensure we have at least CONVENTIONAL_DECIMAL_PLACES.
+    .padEnd(CONVENTIONAL_DECIMAL_PLACES, '0');
+
+  if (!decstr) {
+    // No decimals to display.
+    return `${unitstr}`;
+  }
+
+  // Display a decimal point with the units and decimals.
+  return `${unitstr}.${decstr}`;
+}
diff --git a/packages/zoe/src/issuerTable.js b/packages/zoe/src/issuerTable.js
index ecc1e2e3509..a7f8370dccf 100644
--- a/packages/zoe/src/issuerTable.js
+++ b/packages/zoe/src/issuerTable.js
@@ -68,7 +68,7 @@ const makeIssuerTable = () => {
         brand,
         issuer,
         amountMath,
-        displayInfo,
+        displayInfo: { ...displayInfo, amountMathKind },
       });
       return issuerTable.getByBrand(brand);
     },