Addition & subtractionGrade 1
Pairs to 10 practice
Pairs that make 10: the game shows 10 is 2 and ?, and you type the missing part. Knowing these pairs by heart is what makes adding with carrying easy later.
Example problems
10
is
2
and
8
10
is
9
and
1
10
is
4
and
6
How a practice round works
A round has 10 problems from this skill. Type the digits into the dotted boxes; if a digit is wrong, you simply try again. Get 5 of your last 6 problems right on the first try to master the skill, then keep practicing to earn up to three stars.
Learn these first
This is a starting skill: nothing to learn before it.