Addition & subtractionGrade 1
2-Digit - 1-Digit practice
Subtract a one-digit number from a two-digit number without borrowing, such as 42 − 2, with some whole-tens problems such as 80 − 40.
Example problems
80
−
40
＝
4
0
90
−
20
＝
7
0
42
−
2
＝
4
0
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.