diff --git a/domain/src/main/java/org/oppia/domain/classify/rules/numericinput/NumericInputIsLessThanOrEqualToRuleClassifierProvider.kt b/domain/src/main/java/org/oppia/domain/classify/rules/numericinput/NumericInputIsLessThanOrEqualToRuleClassifierProvider.kt
index dd7f27a1722..359dab7a32b 100644
--- a/domain/src/main/java/org/oppia/domain/classify/rules/numericinput/NumericInputIsLessThanOrEqualToRuleClassifierProvider.kt
+++ b/domain/src/main/java/org/oppia/domain/classify/rules/numericinput/NumericInputIsLessThanOrEqualToRuleClassifierProvider.kt
@@ -23,7 +23,6 @@ internal class NumericInputIsLessThanOrEqualToRuleClassifierProvider @Inject con
     )
   }
 
-  // TODO(#210): Add tests for this classifier.
   override fun matches(answer: Double, input: Double): Boolean {
     return answer <= input
   }
diff --git a/domain/src/test/java/org/oppia/domain/classify/rules/NumericInputIsLessThanOrEqualToRuleClassifierProviderTest.kt b/domain/src/test/java/org/oppia/domain/classify/rules/NumericInputIsLessThanOrEqualToRuleClassifierProviderTest.kt
new file mode 100644
index 00000000000..7477cdccccf
--- /dev/null
+++ b/domain/src/test/java/org/oppia/domain/classify/rules/NumericInputIsLessThanOrEqualToRuleClassifierProviderTest.kt
@@ -0,0 +1,265 @@
+package org.oppia.domain.classify.rules
+
+import android.app.Application
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.google.common.truth.Truth.assertThat
+import dagger.BindsInstance
+import dagger.Component
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.oppia.app.model.InteractionObject
+import org.oppia.domain.classify.rules.numericinput.NumericInputIsLessThanOrEqualToRuleClassifierProvider
+import org.robolectric.annotation.Config
+import org.robolectric.annotation.LooperMode
+import javax.inject.Inject
+import javax.inject.Singleton
+import kotlin.reflect.KClass
+import kotlin.reflect.full.cast
+import kotlin.test.fail
+
+/** Tests for [NumericInputIsLessThanOrEqualToRuleClassifierProvider]. */
+@RunWith(AndroidJUnit4::class)
+@LooperMode(LooperMode.Mode.PAUSED)
+@Config(manifest = Config.NONE)
+class NumericInputIsLessThanOrEqualToRuleClassifierProviderTest {
+
+  private val POSITIVE_REAL_VALUE_1_5 = createReal(value = 1.5)
+  private val POSITIVE_REAL_VALUE_3_5 = createReal(value = 3.5)
+  private val NEGATIVE_REAL_VALUE_1_5 = createReal(value = -1.5)
+  private val NEGATIVE_REAL_VALUE_3_5 = createReal(value = -3.5)
+  private val STRING_VALUE = createString(value = "test")
+  private val POSITIVE_INT_VALUE_3 = createInt(value = 3)
+  private val POSITIVE_INT_VALUE_1 = createInt(value = 1)
+  private val NEGATIVE_INT_VALUE_1 = createInt(value = -1)
+  private val NEGATIVE_INT_VALUE_3 = createInt(value = -3)
+
+  @Inject
+  internal lateinit var numericInputIsLessThanOrEqualToRuleClassifierProvider:
+    NumericInputIsLessThanOrEqualToRuleClassifierProvider
+
+  private val inputIsLessThanOrEqualToRuleClassifier by lazy {
+    numericInputIsLessThanOrEqualToRuleClassifierProvider.createRuleClassifier()
+  }
+
+  @Before
+  fun setUp() {
+    setUpTestApplicationComponent()
+  }
+
+  @Test
+  fun testPositiveRealAnswer_positiveRealInput_sameExactValues_answerLesserOrEqual() {
+    val inputs = mapOf("x" to POSITIVE_REAL_VALUE_1_5)
+
+    val matches =
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = POSITIVE_REAL_VALUE_1_5, inputs = inputs)
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testNegativeRealAnswer_negativeRealInput_sameExactValues_answerLesserOrEqual() {
+    val inputs = mapOf("x" to NEGATIVE_REAL_VALUE_1_5)
+
+    val matches =
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = NEGATIVE_REAL_VALUE_1_5, inputs = inputs)
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testPositiveRealAnswer_positiveRealInput_answerValueLesser_answerLesserOrEqual() {
+    val inputs = mapOf("x" to POSITIVE_REAL_VALUE_3_5)
+
+    val matches =
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = POSITIVE_REAL_VALUE_1_5, inputs = inputs)
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testPositiveRealAnswer_positiveRealInput_answerValueGreater_answerNotLesserOrEqual() {
+    val inputs = mapOf("x" to POSITIVE_REAL_VALUE_1_5)
+
+    val matches =
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = POSITIVE_REAL_VALUE_3_5, inputs = inputs)
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testNegativeRealAnswer_negativeRealInput_answerValueLesser_answerLesserOrEqual() {
+    val inputs = mapOf("x" to NEGATIVE_REAL_VALUE_1_5)
+
+    val matches =
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = NEGATIVE_REAL_VALUE_3_5, inputs = inputs)
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testNegativeRealAnswer_negativeRealInput_answerValueGreater_answerNotLesserOrEqual() {
+    val inputs = mapOf("x" to NEGATIVE_REAL_VALUE_3_5)
+
+    val matches =
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = NEGATIVE_REAL_VALUE_1_5, inputs = inputs)
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testNegativeRealAnswer_positiveRealInput_answerValueLesser_answerLesserOrEqual() {
+    val inputs = mapOf("x" to POSITIVE_REAL_VALUE_1_5)
+
+    val matches =
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = NEGATIVE_REAL_VALUE_3_5, inputs = inputs)
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testPositiveRealAnswer_negativeRealInput_answerValueGreater_answerNotLesserOrEqual() {
+    val inputs = mapOf("x" to NEGATIVE_REAL_VALUE_1_5)
+
+    val matches =
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = POSITIVE_REAL_VALUE_1_5, inputs = inputs)
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testPositiveIntAnswer_negativeIntInput_answerValueGreater_answerNotLesserOrEqual() {
+    val inputs = mapOf("x" to NEGATIVE_INT_VALUE_3)
+
+    val matches =
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = POSITIVE_INT_VALUE_1, inputs = inputs)
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testNegativeIntAnswer_positiveIntInput_answerValueLesser_answerLesserOrEqual() {
+    val inputs = mapOf("x" to POSITIVE_INT_VALUE_3)
+
+    val matches =
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = NEGATIVE_INT_VALUE_1, inputs = inputs)
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testRealAnswer_missingInput_throwsException() {
+    val inputs = mapOf("y" to POSITIVE_REAL_VALUE_1_5)
+
+    val exception = assertThrows(IllegalStateException::class) {
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = POSITIVE_REAL_VALUE_1_5, inputs = inputs)
+    }
+
+    assertThat(exception)
+      .hasMessageThat()
+      .contains("Expected classifier inputs to contain parameter with name 'x'")
+  }
+
+  @Test
+  fun testRealAnswer_stringInput_throwsException() {
+    val inputs = mapOf("x" to STRING_VALUE)
+
+    val exception = assertThrows(IllegalStateException::class) {
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = POSITIVE_REAL_VALUE_1_5, inputs = inputs)
+    }
+
+    assertThat(exception)
+      .hasMessageThat()
+      .contains("Expected input value to be of type REAL not NORMALIZED_STRING")
+  }
+
+  @Test
+  fun testIntAnswer_missingInput_throwsException() {
+    val inputs = mapOf("y" to POSITIVE_INT_VALUE_1)
+
+    val exception = assertThrows(IllegalStateException::class) {
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = POSITIVE_INT_VALUE_1, inputs = inputs)
+    }
+
+    assertThat(exception)
+      .hasMessageThat()
+      .contains("Expected classifier inputs to contain parameter with name 'x'")
+  }
+
+  @Test
+  fun testIntAnswer_stringInput_throwsException() {
+    val inputs = mapOf("x" to STRING_VALUE)
+
+    val exception = assertThrows(IllegalStateException::class) {
+      inputIsLessThanOrEqualToRuleClassifier
+        .matches(answer = POSITIVE_INT_VALUE_1, inputs = inputs)
+    }
+
+    assertThat(exception)
+      .hasMessageThat()
+      .contains("Expected input value to be of type REAL not NORMALIZED_STRING")
+  }
+
+  private fun createReal(value: Double): InteractionObject {
+    return InteractionObject.newBuilder().setReal(value).build()
+  }
+
+  private fun createString(value: String): InteractionObject {
+    return InteractionObject.newBuilder().setNormalizedString(value).build()
+  }
+
+  private fun createInt(value: Int): InteractionObject {
+    return InteractionObject.newBuilder().setReal(value.toDouble()).build()
+  }
+
+  private fun setUpTestApplicationComponent() {
+    DaggerNumericInputIsLessThanOrEqualToRuleClassifierProviderTest_TestApplicationComponent
+      .builder()
+      .setApplication(ApplicationProvider.getApplicationContext())
+      .build()
+      .inject(this)
+  }
+
+  // TODO(#89): Move to a common test library.
+  private fun <T : Throwable> assertThrows(type: KClass<T>, operation: () -> Unit): T {
+    try {
+      operation()
+      fail("Expected to encounter exception of $type")
+    } catch (t: Throwable) {
+      if (type.isInstance(t)) {
+        return type.cast(t)
+      }
+      // Unexpected exception; throw it.
+      throw t
+    }
+  }
+
+  // TODO(#89): Move this to a common test application component.
+  @Singleton
+  @Component(modules = [])
+  interface TestApplicationComponent {
+    @Component.Builder
+    interface Builder {
+      @BindsInstance
+      fun setApplication(application: Application): Builder
+
+      fun build(): TestApplicationComponent
+    }
+
+    fun inject(test: NumericInputIsLessThanOrEqualToRuleClassifierProviderTest)
+  }
+}