Suzanne said:
Did you know that Windows has a calculator?
Pretty bad if anyone needs a calculator to multiply single digit
integers. For that matter, it's bad if someone even needs a pencil and
paper. In my misguided youth schools required memorization up to 10
squared, but a few kids a few years younger the requirement was extended
to 12 squared.
Multiples of nine are easy because you can add a zero (equivalent to
multiplying by ten) then subtract the original value back off (for
instance 9*7=70-7=63)