Number of unresolved LSNe Ia (blue) is compared with the number of resolved cases (orange) for one cumulative year of LSST observation at different critical angular resolution (θ_crit) above which the images can be resolved. The solid curves are calculated assuming the macro-magnifications only, whereas the dashed curves consider the microlensing effects. LSST can resolve images up to θ_th ≈ 0.5 arcsec ~ 2/3θ_psf. For this threshold, we obtain approximately 71.1 unresolved (blue dot) and 27.8 resolved (orange dot) LSNe Ia based solely on macro-magnification calculation, indicating roughly 2.6 times more unresolved systems. The ratio increases to approximately 3.2 when we account for microlensing, as evident from the dashed curves. We emphasize that these numbers correspond to one effective year of LSST observation over 20 000 deg² in i-band. LSST will observe a sky location cumulatively for ~4 years on average during its ten-year run. Therefore, it is essential to scale these figures by a factor of ~4 to get the realistic predictions.