Listed below are materials that you can use in your math activities. You don't need to use exactly what are suggested  these are just ideas.
Whatever materials you collect, be sure to keep them handy in an old icecream bucket or shoe box,or something similar so that they are readily available for your "instructional" use and your child's noninstructional play.
Involve your child in as many activities as possible. Collect the items together. Keep the items in a "Math Center." The best person to help you to get ideas about what to collect is your child.
Item  Notes 
Objects small enough so that
5 can fit in your hand. e.g. crayons, lego, pennies,
golf balls. 
Try to avoid small objects that can be easily ingested by young children. Do not use uncooked, raw kidney beans as they are highly toxic. 
Number flash cards from 0
to 100. download attachments 
You can use these five documents to printout and cut up to make the cards. Remember, do this with your child. 
Fraction flash cards  one whole,
one half, one third, and one quarter 
You can download, print, and cut this document to get these fraction cards. 
Collection of money. 100
pennies, 10 dimes, 5 nickels, 4 quarters 
You may want to buy a "toy" cash register (maybe at a garage sale?). You can buy play money but I recommend that you use real money to continue to build the connections between the math play and the real world. 
10 paper plates for sorting and
comparing 

Play dough 

Sand 

Pudding mix 
Preferably chocolate  yum yum! 
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