diff --git a/src/lib/expr.ts b/src/lib/expr.ts
index 4bd6b09..00dce77 100644
--- a/src/lib/expr.ts
+++ b/src/lib/expr.ts
@@ -77,13 +77,13 @@ const Operators: TokenHandler[] = [
     leftBindingPower: -1,
     token: MINUS_TOKEN,
     parse: (left, matched, parser) =>
-      map(parser.parseSubExpression(0), (right) => ({value: -right})),
+      map(parser.parseSubExpression(99), (right) => ({value: -right})),
   },
   makeInfixOp(PLUS_TOKEN, 10, 11, (left, right) => ({ value: left + right })),
   makeInfixOp(MINUS_TOKEN, 10, 11, (left, right) => ({ value: left - right })),
-  makeInfixOp(TIMES_TOKEN, 10, 11, (left, right) => ({ value: left * right })),
-  makeInfixOp(FLOOR_TOKEN, 10, 11, (left, right) => ({ value: Math.floor(left / right) })),
-  makeInfixOp(DIV_TOKEN, 10, 11, (left, right) => ({ value: left / right })),
+  makeInfixOp(TIMES_TOKEN, 20, 21, (left, right) => ({ value: left * right })),
+  makeInfixOp(FLOOR_TOKEN, 20, 21, (left, right) => ({ value: Math.floor(left / right) })),
+  makeInfixOp(DIV_TOKEN, 20, 21, (left, right) => ({ value: left / right })),
 ];
 
 const ZERO = { value: 0 };