Addition & subtractionGrade 1
2-Digit + 1-Digit practice
Add a one-digit number to a two-digit number without carrying, such as 74 + 4, with some whole-tens problems such as 70 + 20 mixed in.
Example problems
70
＋
20
＝
9
0
80
＋
10
＝
9
0
74
＋
4
＝
7
8
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.