Halloween Math Monster: Addition and Subtraction up to 100

GAME INFO
Create a math monster on Halloween is an online educational game to practice and study addition and subtraction, with numbers up to 10, 20 or 100 as you choose. By age, children practice addition and subtraction up to 10 with 5 and 6 years old in primary education; and perform two-digit addition and subtraction around 7 years old. By clicking on the cogwheel you can choose the addition and subtraction operation(s) you want to practice, as well as the number range.