1diff --git a/src/Parser/ParserConstants.ts b/src/Parser/ParserConstants.ts
 2index c64dfaf..87e3e28 100644
 3--- a/src/Parser/ParserConstants.ts
 4+++ b/src/Parser/ParserConstants.ts
 5@@ -365,6 +365,7 @@ const enum State {
 6   NUMBER_FOLLOWED_BY_SLASH = 28,
 7   NUMBER_FOLLOWED_BY_CARROT = 29,
 8   ADD_TWO_NUMBERS = 45,
 9+  LESS_THAN_EQUALS = 46,
10   SUBTRACT_TWO_NUMBERS = 52,
11   MULTIPLY_TWO_NUMBERS = 53,
12   DIVIDE_TWO_NUMBERS = 54,
13@@ -684,7 +685,7 @@ table[State.LESS_THAN] = ObjectBuilder
14   .add(Symbol.VARIABLE_SEQUENCE, 3)
15   .add(Symbol.NUMBER, State.START_NUMBER)
16   .add(Symbol.STRING, [SHIFT, State.START_STRING])
17-  .add(Symbol.EQUALS, [SHIFT, 46])
18+  .add(Symbol.EQUALS, [SHIFT, State.LESS_THAN_EQUALS])
19   .add(Symbol.PLUS, [SHIFT, 10])
20   .add(Symbol.LEFT_PAREN, [SHIFT, State.LEFT_PAREN])
21   .add(Symbol.GREATER_THAN, [SHIFT, 47])
22@@ -960,7 +961,7 @@ table[State.ADD_TWO_NUMBERS] = ObjectBuilder
23   .add(Symbol.SEMI_COLON, [REDUCE, ReduceActions.PLUS])
24   .add(Symbol.COMMA, [REDUCE, ReduceActions.PLUS])
25   .build();
26-table[46] = ObjectBuilder
27+table[State.LESS_THAN_EQUALS] = ObjectBuilder
28   .add(Symbol.ERROR, 13)
29   .add(Symbol.EXPRESSION, 67)
30   .add(Symbol.VARIABLE_SEQUENCE, 3)
31diff --git a/src/Sheet.ts b/src/Sheet.ts
32index 88935c9..4742d46 100644
33--- a/src/Sheet.ts
34+++ b/src/Sheet.ts
35@@ -377,7 +377,7 @@ let Sheet = (function () {
36           break;
37 
38         case '<=':
39-          result = (exp1 === exp2);
40+          result = (exp1 <= exp2);
41           break;
42 
43         case '<>':
44diff --git a/tests/Parser/ParseEngineTest.ts b/tests/Parser/ParseEngineTest.ts
45index 2a46b2e..d9246d2 100644
46--- a/tests/Parser/ParseEngineTest.ts
47+++ b/tests/Parser/ParseEngineTest.ts
48@@ -207,7 +207,7 @@ let helper = {
49         break;
50 
51       case '<=':
52-        result = (exp1 === exp2);
53+        result = (exp1 <= exp2);
54         break;
55 
56       case '<>':
57@@ -376,7 +376,7 @@ test("Parse equality operators", function(){
58   assertEquals(parser.parse('1 < 2'), true);
59   assertEquals(parser.parse('1 < 0'), false);
60   assertEquals(parser.parse('1 <= 1'), true);
61-  // assertEquals('= 1 <= 2', true); // TODO: Fails.
62+  assertEquals(parser.parse('1 <= 2'), true);// fails...
63   assertEquals(parser.parse('1 >= 1'), true);
64   assertEquals(parser.parse('2 >= 1'), true);
65   assertEquals(parser.parse('1 >= 0'), true);
66@@ -388,7 +388,7 @@ test("Parse equality operators", function(){
67 test("Parse operators, order of operations", function(){
68   assertEquals(parser.parse('10 + -10'), 0);
69   assertEquals(parser.parse('10 + -10 = 0'), true);
70-  // assertEquals(parser.parse('10 + -10 = 0 & "str"'), false); // TODO should pass.
71+  assertEquals(parser.parse('10 + -10 = 0 & "str"'), false);
72   assertEquals(parser.parse('-10%'), -0.1);
73   assertEquals(parser.parse('10 + 10%'), 10.1);
74   assertEquals(parser.parse('-10 + 10%'), -9.9);
75@@ -521,4 +521,4 @@ test("Parse range following comma", function(){
76 
77 
78 
79-assertEquals(parser.parse('SUM(1, 2, 3)'), 6);
80+assertEquals(parser.parse('1 <= 2'), true);