diff --git a/core/src/main/java/org/openedx/core/domain/model/Progress.kt b/core/src/main/java/org/openedx/core/domain/model/Progress.kt
index 800a9c292..edbcf0f90 100644
--- a/core/src/main/java/org/openedx/core/domain/model/Progress.kt
+++ b/core/src/main/java/org/openedx/core/domain/model/Progress.kt
@@ -3,6 +3,7 @@ package org.openedx.core.domain.model
 import android.os.Parcelable
 import kotlinx.parcelize.IgnoredOnParcel
 import kotlinx.parcelize.Parcelize
+import org.openedx.core.extension.safeDivBy
 
 @Parcelize
 data class Progress(
@@ -11,11 +12,7 @@ data class Progress(
 ) : Parcelable {
 
     @IgnoredOnParcel
-    val value: Float = try {
-        assignmentsCompleted.toFloat() / totalAssignmentsCount.toFloat()
-    } catch (_: ArithmeticException) {
-        0f
-    }
+    val value: Float = assignmentsCompleted.toFloat().safeDivBy(totalAssignmentsCount.toFloat())
 
     companion object {
         val DEFAULT_PROGRESS = Progress(0, 0)
diff --git a/core/src/main/java/org/openedx/core/extension/FloatExt.kt b/core/src/main/java/org/openedx/core/extension/FloatExt.kt
new file mode 100644
index 000000000..b59d3ea6a
--- /dev/null
+++ b/core/src/main/java/org/openedx/core/extension/FloatExt.kt
@@ -0,0 +1,20 @@
+package org.openedx.core.extension
+
+/**
+ * Safely divides this Float by [divisor], returning 0f if:
+ *  - [divisor] is zero,
+ *  - the result is NaN.
+ *
+ * Workaround for accessibility issue:
+ * https://github.com/openedx/openedx-app-android/issues/442
+ */
+fun Float.safeDivBy(divisor: Float): Float = try {
+    var result = this / divisor
+    if (result.isNaN()) {
+        result = 0f
+    }
+    result
+} catch (_: ArithmeticException) {
+    0f
+}
+
diff --git a/course/src/main/java/org/openedx/course/presentation/offline/CourseOfflineViewModel.kt b/course/src/main/java/org/openedx/course/presentation/offline/CourseOfflineViewModel.kt
index 19d67f79b..951433e1e 100644
--- a/course/src/main/java/org/openedx/course/presentation/offline/CourseOfflineViewModel.kt
+++ b/course/src/main/java/org/openedx/course/presentation/offline/CourseOfflineViewModel.kt
@@ -14,6 +14,7 @@ import kotlinx.coroutines.launch
 import org.openedx.core.BlockType
 import org.openedx.core.data.storage.CorePreferences
 import org.openedx.core.domain.model.Block
+import org.openedx.core.extension.safeDivBy
 import org.openedx.core.module.DownloadWorkerController
 import org.openedx.core.module.db.DownloadDao
 import org.openedx.core.module.db.DownloadModel
@@ -187,19 +188,25 @@ class CourseOfflineViewModel(
         completedDownloads: List<DownloadModel>,
         downloadedBlocks: List<Block>
     ) {
-        val downloadedSize = getFilesSize(downloadedBlocks)
+        val downloadedSize = getFilesSize(downloadedBlocks).toFloat()
         val realDownloadedSize = completedDownloads.sumOf { it.size }
         val largestDownloads = completedDownloads
             .sortedByDescending { it.size }
             .take(n = 5)
+        val progressBarValue = downloadedSize.safeDivBy(totalDownloadableSize.toFloat())
+        val readyToDownloadSize = if (progressBarValue >= 1) {
+            0
+        } else {
+            totalDownloadableSize - realDownloadedSize
+        }
 
         _uiState.update {
             it.copy(
                 isHaveDownloadableBlocks = true,
                 largestDownloads = largestDownloads,
-                readyToDownloadSize = (totalDownloadableSize - downloadedSize).toFileSize(1, false),
+                readyToDownloadSize = readyToDownloadSize.toFileSize(1, false),
                 downloadedSize = realDownloadedSize.toFileSize(1, false),
-                progressBarValue = downloadedSize.toFloat() / totalDownloadableSize.toFloat()
+                progressBarValue = progressBarValue
             )
         }
     }
diff --git a/course/src/main/java/org/openedx/course/presentation/ui/CourseUI.kt b/course/src/main/java/org/openedx/course/presentation/ui/CourseUI.kt
index 2598ad8ac..f0a87d8f4 100644
--- a/course/src/main/java/org/openedx/course/presentation/ui/CourseUI.kt
+++ b/course/src/main/java/org/openedx/course/presentation/ui/CourseUI.kt
@@ -84,6 +84,7 @@ import org.openedx.core.domain.model.AssignmentProgress
 import org.openedx.core.domain.model.Block
 import org.openedx.core.domain.model.BlockCounts
 import org.openedx.core.domain.model.CourseDatesBannerInfo
+import org.openedx.core.extension.safeDivBy
 import org.openedx.core.module.db.DownloadModel
 import org.openedx.core.module.db.DownloadedState
 import org.openedx.core.module.db.FileType
@@ -260,11 +261,7 @@ fun OfflineQueueCard(
                 maxLines = 1
             )
 
-            val progress = if (progressSize == 0L) {
-                0f
-            } else {
-                progressValue.toFloat() / progressSize
-            }
+            val progress = progressValue.toFloat().safeDivBy(progressSize.toFloat())
             LinearProgressIndicator(
                 modifier = Modifier
                     .fillMaxWidth()
diff --git a/dashboard/src/main/java/org/openedx/courses/presentation/AllEnrolledCoursesView.kt b/dashboard/src/main/java/org/openedx/courses/presentation/AllEnrolledCoursesView.kt
index 4f5f09080..b204d94d8 100644
--- a/dashboard/src/main/java/org/openedx/courses/presentation/AllEnrolledCoursesView.kt
+++ b/dashboard/src/main/java/org/openedx/courses/presentation/AllEnrolledCoursesView.kt
@@ -432,16 +432,11 @@ fun CourseItem(
                         .fillMaxWidth()
                         .aspectRatio(16f / 9f)
                 )
-                val progress: Float = try {
-                    course.progress.assignmentsCompleted.toFloat() / course.progress.totalAssignmentsCount.toFloat()
-                } catch (_: ArithmeticException) {
-                    0f
-                }
                 LinearProgressIndicator(
                     modifier = Modifier
                         .fillMaxWidth()
                         .height(8.dp),
-                    progress = progress,
+                    progress = course.progress.value,
                     color = MaterialTheme.appColors.primary,
                     backgroundColor = MaterialTheme.appColors.divider
                 )
diff --git a/dashboard/src/main/java/org/openedx/courses/presentation/DashboardGalleryView.kt b/dashboard/src/main/java/org/openedx/courses/presentation/DashboardGalleryView.kt
index e036238d5..5e81aba4a 100644
--- a/dashboard/src/main/java/org/openedx/courses/presentation/DashboardGalleryView.kt
+++ b/dashboard/src/main/java/org/openedx/courses/presentation/DashboardGalleryView.kt
@@ -575,17 +575,11 @@ private fun PrimaryCourseCard(
                 modifier = Modifier
                     .fillMaxWidth()
             )
-            val progress: Float = try {
-                primaryCourse.progress.assignmentsCompleted.toFloat() /
-                        primaryCourse.progress.totalAssignmentsCount.toFloat()
-            } catch (_: ArithmeticException) {
-                0f
-            }
             LinearProgressIndicator(
                 modifier = Modifier
                     .fillMaxWidth()
                     .height(8.dp),
-                progress = progress,
+                progress = primaryCourse.progress.value,
                 color = MaterialTheme.appColors.primary,
                 backgroundColor = MaterialTheme.appColors.divider
             )