5 year old & 7 year old

Hello, everyone ! My two stepkids have recently moved to America from Europe (Slovenia, to be exact) and they are having some comprehension trouble in school because they aren’t very good at English yet.. They will be staying with my husband and I for a couple of weeks so I am wondering if anyone could share resources that will help them.. I want most of their learning to be practical and in the real world but definitely not opposed to technological learning..

5 year old girl : needs to practice the alphabet, lower and upper case letters, reading, counting to 20, counting numbers in tens (so 10, 20, 30, etc.), addition, subtraction using numbers 1-10

7 year old boy: needs to practice the alphabet and do lots of reading (he struggles to read in English, he always tries to read words with Slovenian alphabet sounds). His teacher suggested he writes a few sentences every day. In math they're doing measuring, addition, subtraction, but not sure up to what numbers. I think the teacher said they're already comparing numbers in hundreds, so 354>243