Back to input mode User guide

It seems like you’re trying to submit a blank exercise. Please try to solve the exercise and then submit it!

Sign in
Login with code

Sign in

Registration Forgot password?
2.12.

Adding and subtracting two-digit numbers with crossing tens – 3-term sums

LEVEL 6

1.
2.

LEVEL 7

3.
4.
5.

LEVEL 8

6.
7.

LEVEL 10

8.
9.
10.
11.
12.
13.

LEVEL 12

14.
15.
16.
17.
Write test
Previous lesson Next lesson
Back to curriculum

You haven’t saved any solutions for this exercise category. .

Practice