diff --git a/client/src/app/shared/models/motions/motion-poll.ts b/client/src/app/shared/models/motions/motion-poll.ts
index 0e551bdbd..1e39d6584 100644
--- a/client/src/app/shared/models/motions/motion-poll.ts
+++ b/client/src/app/shared/models/motions/motion-poll.ts
@@ -13,6 +13,7 @@ export enum MotionPollMethod {
 export class MotionPoll extends BasePoll<MotionPoll, MotionOption, MotionPollMethod, PercentBase> {
     public static COLLECTIONSTRING = 'motions/motion-poll';
     public static defaultGroupsConfig = 'motion_poll_default_groups';
+    public static DECIMAL_FIELDS = ['votesvalid', 'votesinvalid', 'votescast'];
 
     public id: number;
     public motion_id: number;
@@ -29,4 +30,8 @@ export class MotionPoll extends BasePoll<MotionPoll, MotionOption, MotionPollMet
     public constructor(input?: any) {
         super(MotionPoll.COLLECTIONSTRING, input);
     }
+
+    protected getDecimalFields(): string[] {
+        return MotionPoll.DECIMAL_FIELDS;
+    }
 }
diff --git a/client/src/app/shared/models/poll/base-poll.ts b/client/src/app/shared/models/poll/base-poll.ts
index 103bfe4c0..b5737c374 100644
--- a/client/src/app/shared/models/poll/base-poll.ts
+++ b/client/src/app/shared/models/poll/base-poll.ts
@@ -108,8 +108,4 @@ export abstract class BasePoll<
     public get nextState(): PollState {
         return this.state + 1;
     }
-
-    protected getDecimalFields(): string[] {
-        return ['votesvalid', 'votesinvalid', 'votescast'];
-    }
 }
diff --git a/client/src/app/shared/pipes/parse-poll-number.pipe.ts b/client/src/app/shared/pipes/parse-poll-number.pipe.ts
index 9f016aa18..de2e97341 100644
--- a/client/src/app/shared/pipes/parse-poll-number.pipe.ts
+++ b/client/src/app/shared/pipes/parse-poll-number.pipe.ts
@@ -17,7 +17,7 @@ export class ParsePollNumberPipe implements PipeTransform {
 
     public constructor(private translate: TranslateService) {}
 
-    public transform(value: number): number | string {
+    public transform(value: number): string {
         switch (value) {
             case VOTE_MAJORITY:
                 return this.translate.instant('majority');
diff --git a/client/src/app/site/motions/models/view-motion-poll.ts b/client/src/app/site/motions/models/view-motion-poll.ts
index b687a544d..136837c23 100644
--- a/client/src/app/site/motions/models/view-motion-poll.ts
+++ b/client/src/app/site/motions/models/view-motion-poll.ts
@@ -67,6 +67,10 @@ export class ViewMotionPoll
     public anySpecialVotes(): boolean {
         return this.result.yes < 0 || this.result.no < 0 || this.result.abstain < 0;
     }
+
+    protected getDecimalFields(): string[] {
+        return MotionPoll.DECIMAL_FIELDS;
+    }
 }
 
 export interface ViewMotionPoll extends MotionPoll {
diff --git a/client/src/app/slides/assignments/assignment-poll/assignment-poll-slide.component.ts b/client/src/app/slides/assignments/assignment-poll/assignment-poll-slide.component.ts
index f373647b7..d5172dd88 100644
--- a/client/src/app/slides/assignments/assignment-poll/assignment-poll-slide.component.ts
+++ b/client/src/app/slides/assignments/assignment-poll/assignment-poll-slide.component.ts
@@ -1,5 +1,6 @@
 import { Component } from '@angular/core';
 
+import { AssignmentPoll } from 'app/shared/models/assignments/assignment-poll';
 import { PollState } from 'app/shared/models/poll/base-poll';
 import { AssignmentPollService } from 'app/site/assignments/modules/assignment-poll/services/assignment-poll.service';
 import { BasePollSlideComponentDirective } from 'app/slides/polls/base-poll-slide.component';
@@ -17,4 +18,8 @@ export class AssignmentPollSlideComponent extends BasePollSlideComponentDirectiv
     public PollState = PollState;
 
     public options = { maintainAspectRatio: false, responsive: true, legend: { position: 'right' } };
+
+    protected getDecimalFields(): string[] {
+        return AssignmentPoll.DECIMAL_FIELDS;
+    }
 }
diff --git a/client/src/app/slides/motions/motion-poll/motion-poll-slide.component.ts b/client/src/app/slides/motions/motion-poll/motion-poll-slide.component.ts
index e61bf920e..24b97dafe 100644
--- a/client/src/app/slides/motions/motion-poll/motion-poll-slide.component.ts
+++ b/client/src/app/slides/motions/motion-poll/motion-poll-slide.component.ts
@@ -1,5 +1,6 @@
 import { Component } from '@angular/core';
 
+import { MotionPoll } from 'app/shared/models/motions/motion-poll';
 import { PollState } from 'app/shared/models/poll/base-poll';
 import { MotionPollService } from 'app/site/motions/services/motion-poll.service';
 import { PollData, PollTableData } from 'app/site/polls/services/poll.service';
@@ -32,6 +33,10 @@ export class MotionPollSlideComponent extends BasePollSlideComponentDirective<Mo
         });
     }
 
+    protected getDecimalFields(): string[] {
+        return MotionPoll.DECIMAL_FIELDS;
+    }
+
     public showChart(): boolean {
         return this.pollService.showChart(this.pollData);
     }
diff --git a/client/src/app/slides/polls/base-poll-slide.component.ts b/client/src/app/slides/polls/base-poll-slide.component.ts
index 47d5b1839..e36179120 100644
--- a/client/src/app/slides/polls/base-poll-slide.component.ts
+++ b/client/src/app/slides/polls/base-poll-slide.component.ts
@@ -10,7 +10,7 @@ import { BasePollSlideData } from './base-poll-slide-data';
 import { BaseSlideComponentDirective } from '../base-slide-component';
 
 @Directive()
-export class BasePollSlideComponentDirective<
+export abstract class BasePollSlideComponentDirective<
     T extends BasePollSlideData,
     S extends PollService
 > extends BaseSlideComponentDirective<T> {
@@ -19,6 +19,11 @@ export class BasePollSlideComponentDirective<
     @Input()
     public set data(value: SlideData<T>) {
         this._data = value;
+        this.getDecimalFields().forEach(field => {
+            if (value.data.poll[field] !== undefined) {
+                value.data.poll[field] = parseFloat(value.data.poll[field]);
+            }
+        });
         if (value.data.poll.state === PollState.Published) {
             const chartData = this.pollService.generateChartData(value.data.poll);
             this.chartDataSubject.next(chartData);
@@ -37,4 +42,6 @@ export class BasePollSlideComponentDirective<
     ) {
         super();
     }
+
+    protected abstract getDecimalFields(): string[];
 }