Rightstart and Singapore Math both work in 5s and 10s. for 5+7, they would do 5+5+2. for 17+5, similarly 15+5+2. For 9+8, 5+5+4+3=10+7. You also get to 9+8=9+1 + 8-1 (ie make the 9 a 10). Another great game for math facts which most own is Chutes and Ladders. Use a 6 or 9-sided die and have DC add to determine where to land, no counting squares. Then move to using 2 dice. DC can add them, subtract them to determine where to move to. Also, you can subtract them to get negative numbers and move backwards if that puts you in a more favorable position ie if you roll a 3 and a 4, you can move forward 7, move forward 1 (4-3) or move backward 1 (3-4).
We used dominoes all the time for math. You can play addition or subtraction war by each pulling 2 dominoes. YOu can multiply the sides of the dominoes in multiplication war etc.
Dazey
