# MapleSkyStrategy:: _gemForUsds() suffers a rounding error up to approximately 1e12 Usds Low/Info · Three Sigma · Institutional lending · 26th November, 2024 Finding 3S-Maple-L01 of the Maple Cash Strategies security review. - Protocol: https://maple.finance/ - Report: /reports/maple-finance-iv - Source: https://cdn.sanity.io/files/qoqld077/staging/a68d604be9eca467b1f656c2ca775e1cebc2a468.pdf --- ### Description MapleSkyStrategy:: _gemForUsds() computes gemAmount_ = (usdsAmount_ * WAD) / (to18ConversionFactor * (WAD + tout));. As can be seen, to18ConversionFactor is 1e12 for a Usdc gem, which leads to a rounding up to 1e12 Usds. ### Recommendation As the rounding [error](https://github.com/aave-dao/aave-v3-origin/blob/main/src/contracts/protocol/libraries/helpers/Errors.sol#L40) corresponds to only 1e-6 USD and the operation is not called frequently, it's safe to ignore it. ### Status Acknowledged --- Related findings: - [Significant rounding error in whitelist discount that could be avoided](https://0xsimao.com/findings/1inch-rounding-whitelist-discount-avoided): 1inch Fee Extension - [Rounding error in Aave Lending Pool](https://0xsimao.com/findings/gaib-rounding-error-aave-lending): GAIB Pre-Vaults - [Unhandled rounding error in DistributionVault.getClaimable leads to locked dust](https://0xsimao.com/findings/m-0-rounding-claimable-locked-dust): M^0 Minter Gateway - [`GoodDollarExchangeProvider::mintFromExpansion()` will change the price due to a rounding error in the new ratio](https://0xsimao.com/findings/mento-provider-mint-price-rounding): Mento