diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 53b57f5..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,51 +0,0 @@
-dist: bionic
-language: groovy
-jdk:
-- openjdk11
-sudo: false
-addons:
-  chrome: stable
-branches:
-  only:
-  - master
-  - dev
-  - /^feature\/.*$/
-  - /^hotfix\/.*$/
-  - grails3
-  - devg3
-  - grails4
-  - grails4-bs-branch
-  - grails5
-
-before_cache:
-  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
-  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
-cache:
-  directories:
-    - $HOME/.m2
-    - $HOME/.gradle/caches/
-    - $HOME/.gradle/wrapper/
-
-before_install:
-- export TZ=Australia/Canberra
-- rm -rf ~/.nvm && git clone https://github.com/creationix/nvm.git ~/.nvm && (cd ~/.nvm && git checkout `git describe --abbrev=0 --tags`) && source ~/.nvm/nvm.sh && nvm install $TRAVIS_NODE_VERSION
-
-before_script:
-- export DETECT_CHROMEDRIVER_VERSION=true
-- cd $TRAVIS_BUILD_DIR
-- npm install
-- npm run-script package-turf
-script:
-- cd $TRAVIS_BUILD_DIR
-#- ./gradlew -PenableClover=true cloverGenerateReport
-- node_modules/karma/bin/karma start karma.conf.js --single-run --browsers ChromeHeadless
-
-# need to gradlew clean before publishing to rebuild without the clover instrumentation.
-after_success:
-  - '[ "${TRAVIS_PULL_REQUEST}" = "false" ] && travis_retry ./gradlew clean && ./gradlew publish'
-
-env:
-  global:
-  - TRAVIS_NODE_VERSION="15.4.0"
-  - secure: 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
-  - secure: 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
diff --git a/grails-app/assets/javascripts/knockout-utils.js b/grails-app/assets/javascripts/knockout-utils.js
index 7e09a50..d4f9397 100644
--- a/grails-app/assets/javascripts/knockout-utils.js
+++ b/grails-app/assets/javascripts/knockout-utils.js
@@ -164,7 +164,22 @@
      * @param precision the number of decimal places allowed.
      * @returns {Computed<any>}
      */
-    ko.extenders.numericString = function(target, precision) {
+    ko.extenders.numericString = function(target, options) {
+        var defaults = {
+            decimalPlaces: 2,
+            removeTrailingZeros: true // backwards compatibility
+        };
+        if (_.isNumber(options)) {
+            options = {decimalPlaces: options};
+        }
+        options = _.extend({}, defaults, options);
+
+        function roundAndToString(value) {
+            var roundingMultiplier = Math.pow(10, options.decimalPlaces);
+            var roundedValue = Math.round(value * roundingMultiplier) / roundingMultiplier;
+            return roundedValue.toString();
+        }
+
         //create a writable computed observable to intercept writes to our observable
         var result = ko.computed({
             read: target,  //always return the original observables value
@@ -173,18 +188,18 @@
                 if (typeof val === 'string') {
                     val = newValue.replace(/,|\$/g, '');
                 }
-                var current = target(),
-                    roundingMultiplier = Math.pow(10, precision),
-                    newValueAsNum = isNaN(val) ? 0 : parseFloat(+val),
-                    valueToWrite = Math.round(newValueAsNum * roundingMultiplier) / roundingMultiplier;
+                var current = target();
+                var newValueAsNum = isNaN(val) ? 0 : parseFloat(+val);
+
+                var valueToWrite = options.removeTrailingZeros ? roundAndToString(newValueAsNum) : newValueAsNum.toFixed(options.decimalPlaces);
 
                 //only write if it changed
-                if (valueToWrite.toString() !== current || isNaN(val)) {
-                    target(isNaN(val) ? newValue : valueToWrite.toString());
+                if (valueToWrite !== current || isNaN(val)) {
+                    target(isNaN(val) ? newValue : valueToWrite);
                 }
                 else {
                     if (newValue !== current) {
-                        target.notifySubscribers(valueToWrite.toString());
+                        target.notifySubscribers(valueToWrite);
                     }
                 }
             }
diff --git a/grails-app/taglib/au/org/ala/ecodata/forms/ModelJSTagLib.groovy b/grails-app/taglib/au/org/ala/ecodata/forms/ModelJSTagLib.groovy
index b186dde..52ea12a 100644
--- a/grails-app/taglib/au/org/ala/ecodata/forms/ModelJSTagLib.groovy
+++ b/grails-app/taglib/au/org/ala/ecodata/forms/ModelJSTagLib.groovy
@@ -624,7 +624,11 @@ class ModelJSTagLib {
 
     def numberViewModel(JSModelRenderContext ctx) {
         int decimalPlaces = ctx.dataModel.decimalPlaces ?: 2
-        observable(ctx, ["{numericString:${decimalPlaces}}"])
+
+        Map options = new HashMap(ctx.viewModel()?.displayOptions ?: [:])
+        options.decimalPlaces = decimalPlaces
+        String optionString = (options as JSON).toString()
+        observable(ctx, ["{numericString:${optionString}}"])
     }
 
     def dateViewModel(JSModelRenderContext ctx) {
diff --git a/src/test/groovy/au/org/ala/ecodata/forms/ModelJSTagLibSpec.groovy b/src/test/groovy/au/org/ala/ecodata/forms/ModelJSTagLibSpec.groovy
index 4eb3c19..948f175 100644
--- a/src/test/groovy/au/org/ala/ecodata/forms/ModelJSTagLibSpec.groovy
+++ b/src/test/groovy/au/org/ala/ecodata/forms/ModelJSTagLibSpec.groovy
@@ -44,7 +44,7 @@ class ModelJSTagLibSpec extends Specification implements TagLibUnitTest<ModelJST
         tagLib.renderDataModelItem(ctx)
 
         then:
-        actualOut.toString().trim() == 'data.myField = ko.observable().extend({numericString:2}).extend({metadata:{metadata:self.dataModel[\'myField\'], context:self.\$context, config:config}});'
+        actualOut.toString().trim() == 'data.myField = ko.observable().extend({numericString:{"decimalPlaces":2}}).extend({metadata:{metadata:self.dataModel[\'myField\'], context:self.\$context, config:config}});'
     }
 
     void "the feature data type doesn't need any special initialisation behaviour"() {
@@ -84,7 +84,7 @@ class ModelJSTagLibSpec extends Specification implements TagLibUnitTest<ModelJST
         tagLib.numberViewModel(ctx)
 
         then: "the default is 2"
-        actualOut.toString().trim() == "data.item1 = ko.observable().extend({numericString:2});"
+        actualOut.toString().trim() == "data.item1 = ko.observable().extend({numericString:{\"decimalPlaces\":2}});"
 
         when: "a number of decimal places is specified"
         ctx.dataModel.decimalPlaces = 3
@@ -93,7 +93,7 @@ class ModelJSTagLibSpec extends Specification implements TagLibUnitTest<ModelJST
         tagLib.numberViewModel(ctx)
 
         then:
-        actualOut.toString().trim() == "data.item1 = ko.observable().extend({numericString:3});"
+        actualOut.toString().trim() == "data.item1 = ko.observable().extend({numericString:{\"decimalPlaces\":3}});"
 
     }