3+3= ?
1-digit + 1-digit
15-5=?
2-digit - 1 digit
11+22=? or 33-11=?
2-digit +/- 2-digit
123+123=? or 987-87=?
3-digit +/- 2-digit
5×5=?
1-digit x 1-digit
12×2=?
2-digit x 1-digit