KidsMultiply at App Store analyse

2+3? 7x8? or (99-88)x7+?=149
5 games of 26 levels of math exercises to learn addition and times tables. Start from a simple addition and go on to hard math. Practice multiplication and division with a bit of addition and subtraction. You can limit the multiplier to learn times tables gradually.
Your time for an answer is limited, the more you think the more tasks you need to solve to complete a level. After each level you see the best time and an overall score you got. Try to get as close to 18000 points as possible! Compete with your friends!

There are 9 types of tasks in each game.
For simple addition:
a+b limited to 1..3+1..3
a+b limited to 1..4+1..3
a+b limited to 1..5+1..3
a+b limited to 1..6+1..3
a+b limited to 1..7+1..3
a+b limited to 1..8+1..3
a+b limited to 1..9+1..3
a+-b limited to 1..9+1..6
a+-b limited to 1..9+1..9

For multiplication:
axb=?
a/b=?
ax?=c
?/b=c
axb+c=?
axb+cxd=?
axb-cxd=?
axb+c/d=?
a/b+c/d=?

For hard math:
axb+c+d limited to 1..12 1..100
axb=c+?
ax?:b=c
ax?+b=c:d
axb-?=c-d
ax(b+?)=c-d
a+b=cxd+?
(a-b)xc+?=d
axb+?xc=d