Things I've done.

Make flash cards with numbers (have the written out form on the back) and give a stack of cards to each pair. They then take turns quizzing their partners. You could do this with prices or dates.

If you want, you can then make bigger groups and have one person quiz the others. The other students try to say the number the fastest. I tried to give hanko points to the student that was the fastest, but most groups didn't keep track.

Another one is divide the class into groups of 10. Give them A4 papers with only one number or symbol ($ , : Ã‚Â¥) on it. Then say a number and the group has to line up to form the number. Fastest team wins.

Make a bunch of questions with number answers (How many students does our school have?). And have pairs ask each other questions. For some of the answers, I gave them the number to use, but other times, I let them make up their own answer (How many shoes do you have?).

I haven't done dates, but when I did time, I took a train schedule and had the students use that to give the time to / from Shinjuku. For dates, maybe you could make a school or vacation schedule.