*Flash cards (addition and subtraction 1-20)  
    *Math war with a deck of cards (split into two piles; give values to the ace, jack, king, queen, joker or eliminate them; flip the two top cards and add or subtract; make a pile with the correct answers or play with a partner and the person who solves first gets the cards)
    *oral or written "quiz" with a few problems each night
    *an adult supervised app or computer website
    *roll dice and add the numbers 
    *use a calculator to say the problems as you enter them...try three times with the calculator and once by memory