diff --git a/contracts/DODOStablePool/lib/DODOMath.sol b/contracts/DODOStablePool/lib/DODOMath.sol
index e7d098b..8d1cd47 100644
--- a/contracts/DODOStablePool/lib/DODOMath.sol
+++ b/contracts/DODOStablePool/lib/DODOMath.sol
@@ -161,7 +161,7 @@ library DODOMath {
         // bAbs = abs(part1-part2)
         // if part1>part2 => b is negative => bSig is false
         // if part2>part1 => b is positive => bSig is true
-        uint256 part2 = k.mul(V0).div(V1).mul(V0).add(i.mul(delta)); // kQ0^2/Q1-i*deltaB
+        uint256 part2 = k.mul(V0).mul(V0).div(V1).add(i.mul(delta)); // kQ0^2/Q1-i*deltaB
         uint256 bAbs = DecimalMath.ONE.sub(k).mul(V1); // (1-k)Q1
 
         bool bSig;
diff --git a/contracts/lib/DODOMath.sol b/contracts/lib/DODOMath.sol
index ba228ad..1eeafe9 100644
--- a/contracts/lib/DODOMath.sol
+++ b/contracts/lib/DODOMath.sol
@@ -156,7 +156,7 @@ library DODOMath {
         // bAbs = abs(part1-part2)
         // if part1>part2 => b is negative => bSig is false
         // if part2>part1 => b is positive => bSig is true
-        uint256 part2 = k * (V0) / (V1) * (V0) + (i * (delta)); // kQ0^2/Q1-i*deltaB
+        uint256 part2 = k * (V0) * (V0) / (V1) + (i * (delta)); // kQ0^2/Q1-i*deltaB
         uint256 bAbs = (DecimalMath.ONE - k) * (V1); // (1-k)Q1
 
         bool bSig;
diff --git a/test/TestGasSavingPool.t.sol b/test/TestGasSavingPool.t.sol
index 9244a4d..5269e1c 100644
--- a/test/TestGasSavingPool.t.sol
+++ b/test/TestGasSavingPool.t.sol
@@ -211,14 +211,14 @@ contract TestGasSavingPool is Test {
             gsp.getPMMState();
             dsp.getPMMState();
             assertEq(receiveBaseAmount1, receiveBaseAmount2, "gsp receiveBaseAmount != dsp receiveBaseAmount");
-            uint256 tmp = i == 0 ? 1999730072785929125 : 1998897790924520164 ;
+            uint256 tmp = i == 0 ? 1999730072785929125 : 1998897790924520174 ;
             assertEq(receiveBaseAmount1, tmp);
 
             // check baseReserve, quoteReserve
             (baseReserve1, quoteReserve1) = gsp.getVaultReserve();
             (baseReserve2, quoteReserve2) = dsp.getVaultReserve();
             assertEq(baseReserve1, baseReserve2, "gsp baseReserve != dsp baseReserve");
-            tmp = i == 0 ? 8000249929713368009 : 6001332149611046822;
+            tmp = i == 0 ? 8000249929713368009 : 6001332149611046812;
             assertEq(baseReserve1, tmp);
             assertEq(quoteReserve1, quoteReserve2, "gsp quoteReserve != dsp quoteReserve");
             tmp = i == 0 ? 12000000 : 14000000;