Firstly, the numbers you quote are completely unverifiable. Just imagine to be in the middle of a war-zone & making an accurate count of dead people (children). Ok, so let's assume for a minute the figures to be accurate. The 'Gaza Administration i.e. Hamas have built no 'safe-rooms' or bomb shelters to protect their own people with all those billions of USD's, they've been given over the years. Hamas didn't even let Gazan's into the myriad of tunnels they built, which would certainly have provided some shelter against bombing.
Hamas cynically & brutally just use civilians to protect themselves. They want a high rate of civilian casualties because they want gullible people, around the world to lap-up the numbers and incite hatred, to try to isolate Israel.
Every Israeli home has a safe room & there are air-raid shelters on almost every street corner. This all because Israel values life, whereas Hamas values death.